diff --git a/x-pack/platform/plugins/shared/stack_connectors/public/connector_types/slack_api/form_deserializer.test.tsx b/x-pack/platform/plugins/shared/stack_connectors/public/connector_types/slack_api/form_deserializer.test.tsx
index ad5e047d37771..f44f88e368f63 100644
--- a/x-pack/platform/plugins/shared/stack_connectors/public/connector_types/slack_api/form_deserializer.test.tsx
+++ b/x-pack/platform/plugins/shared/stack_connectors/public/connector_types/slack_api/form_deserializer.test.tsx
@@ -46,7 +46,7 @@ describe('deserializer', () => {
       ...data,
       config: {
         ...data.config,
-        allowedChannels: ['#general', '#random'],
+        allowedChannels: [{ name: '#general' }, { name: '#random' }],
       },
     });
   });
diff --git a/x-pack/platform/plugins/shared/stack_connectors/public/connector_types/slack_api/form_deserializer.ts b/x-pack/platform/plugins/shared/stack_connectors/public/connector_types/slack_api/form_deserializer.ts
index 5226204eb6dff..8038589bd2e3a 100644
--- a/x-pack/platform/plugins/shared/stack_connectors/public/connector_types/slack_api/form_deserializer.ts
+++ b/x-pack/platform/plugins/shared/stack_connectors/public/connector_types/slack_api/form_deserializer.ts
@@ -14,10 +14,10 @@ export const deserializer = (data: ConnectorFormSchema): InternalConnectorForm =
   const formattedChannels =
     allowedChannels.map((channel) => {
       if (channel.name.startsWith('#')) {
-        return channel.name;
+        return channel;
       }
 
-      return `#${channel.name}`;
+      return { ...channel, name: `#${channel.name}` };
     }) ?? [];
 
   return {
diff --git a/x-pack/platform/plugins/shared/stack_connectors/public/connector_types/slack_api/form_serializer.test.tsx b/x-pack/platform/plugins/shared/stack_connectors/public/connector_types/slack_api/form_serializer.test.tsx
index acd6107873cb2..08647c22eb21f 100644
--- a/x-pack/platform/plugins/shared/stack_connectors/public/connector_types/slack_api/form_serializer.test.tsx
+++ b/x-pack/platform/plugins/shared/stack_connectors/public/connector_types/slack_api/form_serializer.test.tsx
@@ -35,7 +35,7 @@ describe('serializer', () => {
       isDeprecated: false,
       isSystemAction: false,
       actionTypeId: CONNECTOR_ID,
-      config: { allowedChannels: ['#general', '#random'] },
+      config: { allowedChannels: [{ name: 'general' }, { name: '#random' }] },
       secrets: {},
     };
 
diff --git a/x-pack/platform/plugins/shared/stack_connectors/public/connector_types/slack_api/form_serializer.ts b/x-pack/platform/plugins/shared/stack_connectors/public/connector_types/slack_api/form_serializer.ts
index 7467b79116f42..d2031aa1e1129 100644
--- a/x-pack/platform/plugins/shared/stack_connectors/public/connector_types/slack_api/form_serializer.ts
+++ b/x-pack/platform/plugins/shared/stack_connectors/public/connector_types/slack_api/form_serializer.ts
@@ -6,10 +6,20 @@
  */
 
 import type { ConnectorFormSchema, InternalConnectorForm } from '@kbn/alerts-ui-shared';
+import type { SlackApiConfig } from '@kbn/connector-schemas/slack_api';
 
 export const serializer = (data: InternalConnectorForm): ConnectorFormSchema => {
-  const formAllowedChannels = (data.config?.allowedChannels as string[]) ?? [];
-  const allowedChannels = formAllowedChannels.map((option) => ({ name: option })) ?? [];
+  const formAllowedChannels =
+    (data.config?.allowedChannels as SlackApiConfig['allowedChannels']) ?? [];
+
+  const allowedChannels =
+    formAllowedChannels.map((channel) => {
+      if (channel.name.startsWith('#')) {
+        return channel;
+      }
+
+      return { ...channel, name: `#${channel.name}` };
+    }) ?? [];
 
   return {
     ...data,
diff --git a/x-pack/platform/plugins/shared/stack_connectors/public/connector_types/slack_api/slack_connectors.test.tsx b/x-pack/platform/plugins/shared/stack_connectors/public/connector_types/slack_api/slack_connectors.test.tsx
index 709c4126435d3..b9942adc0a18f 100644
--- a/x-pack/platform/plugins/shared/stack_connectors/public/connector_types/slack_api/slack_connectors.test.tsx
+++ b/x-pack/platform/plugins/shared/stack_connectors/public/connector_types/slack_api/slack_connectors.test.tsx
@@ -212,7 +212,7 @@ describe('SlackActionFields renders', () => {
       expect(screen.getByText('#test')).toBeInTheDocument();
     });
 
-    it('changes the values correctly', async () => {
+    it('changes the values correctly and preserve the id of the channel', async () => {
       render(
         <ConnectorFormTestProvider
           connector={actionConnector}
@@ -232,7 +232,6 @@ describe('SlackActionFields renders', () => {
       await userEvent.click(screen.getByTestId('secrets.token-input'));
       await userEvent.paste('token updated');
 
-      await userEvent.click(screen.getByTestId('comboBoxClearButton'));
       await userEvent.click(screen.getByTestId('comboBoxSearchInput'));
       await userEvent.type(screen.getByTestId('comboBoxSearchInput'), '#new-channel{enter}');
 
@@ -247,7 +246,7 @@ describe('SlackActionFields renders', () => {
               token: 'token updated',
             },
             config: {
-              allowedChannels: [{ name: '#new-channel' }],
+              allowedChannels: [{ id: 'channel-id', name: '#test' }, { name: '#new-channel' }],
             },
           },
           isValid: true,
diff --git a/x-pack/platform/plugins/shared/stack_connectors/public/connector_types/slack_api/slack_connectors.tsx b/x-pack/platform/plugins/shared/stack_connectors/public/connector_types/slack_api/slack_connectors.tsx
index 87018e0d23680..5f62b8d789d1f 100644
--- a/x-pack/platform/plugins/shared/stack_connectors/public/connector_types/slack_api/slack_connectors.tsx
+++ b/x-pack/platform/plugins/shared/stack_connectors/public/connector_types/slack_api/slack_connectors.tsx
@@ -5,19 +5,32 @@
  * 2.0.
  */
 
-import React from 'react';
+import React, { useCallback } from 'react';
 import type {
   ActionConnectorFieldsProps,
   ConfigFieldSchema,
   SecretsFieldSchema,
 } from '@kbn/triggers-actions-ui-plugin/public';
 import { SimpleConnectorForm, useKibana } from '@kbn/triggers-actions-ui-plugin/public';
+import type { EuiComboBoxOptionOption } from '@elastic/eui';
 import { EuiLink, EuiText } from '@elastic/eui';
 import { FormattedMessage } from '@kbn/i18n-react';
 import type { DocLinksStart } from '@kbn/core/public';
 
+import type { FieldValidateResponse } from '@kbn/es-ui-shared-plugin/static/forms/hook_form_lib';
+import {
+  useFormContext,
+  useFormData,
+  VALIDATION_TYPES,
+} from '@kbn/es-ui-shared-plugin/static/forms/hook_form_lib';
+import type { SlackApiConfig } from '@kbn/connector-schemas/slack_api';
 import * as i18n from './translations';
 
+interface AllowedChannels {
+  id: string;
+  name: string;
+}
+
 const getSecretsFormSchema = (docLinks: DocLinksStart): SecretsFieldSchema[] => [
   {
     id: 'token',
@@ -34,59 +47,113 @@ const getSecretsFormSchema = (docLinks: DocLinksStart): SecretsFieldSchema[] =>
   },
 ];
 
-const getConfigFormSchema = (): ConfigFieldSchema<string>[] => [
-  {
-    id: 'allowedChannels',
-    isRequired: false,
-    label: i18n.ALLOWED_CHANNELS,
-    type: 'COMBO_BOX',
-    validations: [
-      {
-        isBlocking: true,
-        validator: (args) => {
-          const valueAsArray = Array.isArray(args.value) ? args.value : [args.value];
-
-          if (valueAsArray.length === 0) {
-            return;
-          }
-
-          const areAllValid = valueAsArray.every((value) => value.startsWith('#'));
-
-          if (areAllValid) {
-            return;
-          }
-
-          return {
-            code: 'ERR_FIELD_FORMAT',
-            formatType: 'COMBO_BOX',
-            message: i18n.CHANNEL_NAME_ERROR,
-          };
-        },
+const areChannelsValid = (channels: AllowedChannels[]) => {
+  if (channels.length === 0) {
+    return true;
+  }
+
+  const areAllValid = channels.every((channel) => channel.name.startsWith('#'));
+
+  if (areAllValid) {
+    return true;
+  }
+
+  return false;
+};
+
+const getAllowedChannlesConfigSchema = (
+  euiFieldProps: ConfigFieldSchema['euiFieldProps']
+): ConfigFieldSchema<AllowedChannels[]> => ({
+  id: 'allowedChannels',
+  isRequired: false,
+  label: i18n.ALLOWED_CHANNELS,
+  type: 'COMBO_BOX',
+  validations: [
+    {
+      isBlocking: true,
+      validator: (args) => {
+        const isValid = areChannelsValid(args.value);
+
+        if (isValid) {
+          return;
+        }
+
+        return {
+          code: 'ERR_FIELD_FORMAT',
+          formatType: 'COMBO_BOX',
+          message: i18n.CHANNEL_NAME_ERROR,
+        };
       },
-    ],
-    euiFieldProps: {
-      noSuggestions: true,
-      autoComplete: 'off',
-      append: (
-        <EuiText size="xs" color="subdued">
-          {i18n.OPTIONAL_LABEL}
-        </EuiText>
-      ),
     },
+  ],
+  euiFieldProps: {
+    ...euiFieldProps,
+    noSuggestions: true,
+    autoComplete: 'off',
+    append: (
+      <EuiText size="xs" color="subdued">
+        {i18n.OPTIONAL_LABEL}
+      </EuiText>
+    ),
   },
-];
+});
 
 export const SlackActionFieldsComponents: React.FC<ActionConnectorFieldsProps> = ({
   readOnly,
   isEdit,
 }) => {
   const { docLinks } = useKibana().services;
+  const { getFields } = useFormContext();
+
+  const [{ config }] = useFormData({
+    watch: ['config.allowedChannels'],
+  });
+
+  const { allowedChannels = [] }: SlackApiConfig = config ?? {};
+
+  const selectedOptions = allowedChannels.map((channel) => ({
+    label: channel.name,
+    value: channel,
+  }));
+
+  const fields = getFields();
+
+  const allowedChannelsField = fields['config.allowedChannels'];
+
+  const onCreateOption = useCallback(
+    (value: string) => {
+      const finalValue = { name: value };
+
+      const { isValid } = allowedChannelsField.validate({
+        value: [finalValue],
+        validationType: VALIDATION_TYPES.ARRAY_ITEM,
+      }) as FieldValidateResponse;
+
+      if (!isValid) {
+        return false;
+      }
+
+      allowedChannelsField.setValue([...allowedChannels, finalValue]);
+    },
+    [allowedChannels, allowedChannelsField]
+  );
+
+  const onChange = useCallback(
+    (options: EuiComboBoxOptionOption<AllowedChannels>[]) => {
+      allowedChannelsField.setValue(
+        options.map((option) => ({ name: option.value?.name, id: option.value?.id }))
+      );
+    },
+    [allowedChannelsField]
+  );
 
   return (
     <SimpleConnectorForm
       isEdit={isEdit}
       readOnly={readOnly}
-      configFormSchema={getConfigFormSchema()}
+      configFormSchema={[
+        getAllowedChannlesConfigSchema({ onChange, onCreateOption, selectedOptions }),
+      ]}
       secretsFormSchema={getSecretsFormSchema(docLinks)}
     />
   );
diff --git a/x-pack/platform/plugins/shared/triggers_actions_ui/public/application/components/simple_connector_form.tsx b/x-pack/platform/plugins/shared/triggers_actions_ui/public/application/components/simple_connector_form.tsx
index 89c228021fbf3..607f2e7e03791 100644
--- a/x-pack/platform/plugins/shared/triggers_actions_ui/public/application/components/simple_connector_form.tsx
+++ b/x-pack/platform/plugins/shared/triggers_actions_ui/public/application/components/simple_connector_form.tsx
@@ -18,9 +18,9 @@ import { FIELD_TYPES, getUseField } from '@kbn/es-ui-shared-plugin/static/forms/
 import { fieldValidators } from '@kbn/es-ui-shared-plugin/static/forms/helpers';
 import { i18n } from '@kbn/i18n';
 
-type Validations<T = string> = Array<ValidationConfig<FormData, string, T>>;
+type Validations<T = any> = Array<ValidationConfig<FormData, string, T>>;
 
-export interface CommonFieldSchema<T = string> {
+export interface CommonFieldSchema<T = any> {
   id: string;
   label: string;
   helpText?: string | ReactNode;
@@ -30,7 +30,7 @@ export interface CommonFieldSchema<T = string> {
   validations?: Validations<T>;
 }
 
-export interface ConfigFieldSchema<T = string> extends CommonFieldSchema<T> {
+export interface ConfigFieldSchema<T = any> extends CommonFieldSchema<T> {
   isUrlField?: boolean;
   requireTld?: boolean;
   defaultValue?: T;
@@ -53,7 +53,7 @@ const UseTextField = getUseField({ component: Field });
 const UseComboBoxField = getUseField({ component: ComboBoxField });
 const { emptyField, urlField } = fieldValidators;
 
-const getFieldConfig = <T extends string | string[] = string>({
+const getFieldConfig = <T,>({
   label,
   isRequired = true,
   isUrlField = false,