diff --git a/package.json b/package.json
index 2c3f26e4afb..e4cac92ad6d 100644
--- a/package.json
+++ b/package.json
@@ -2,7 +2,7 @@
   "dependencies": {
     "@wireapp/antiscroll-2": "1.0.2",
     "@wireapp/avs": "8.0.13",
-    "@wireapp/core": "24.1.1",
+    "@wireapp/core": "24.2.0",
     "@wireapp/react-ui-kit": "7.55.0",
     "@wireapp/store-engine-dexie": "1.6.8",
     "@wireapp/store-engine-sqleet": "1.7.13",
diff --git a/src/script/Config.ts b/src/script/Config.ts
index 9fcbb1dc591..6c4faa3b3d2 100644
--- a/src/script/Config.ts
+++ b/src/script/Config.ts
@@ -112,7 +112,7 @@ export class Configuration {
   readonly ALLOWED_IMAGE_TYPES = ['image/bmp', 'image/gif', 'image/jpeg', 'image/jpg', 'image/png'];
 
   /** Which versions of the backend api do we support */
-  readonly SUPPORTED_API_VERSIONS = [0];
+  readonly SUPPORTED_API_VERSIONS = [1, 0];
 }
 
 let instance: Configuration;
diff --git a/src/script/calling/CallingRepository.ts b/src/script/calling/CallingRepository.ts
index 76fc9cf6cb0..a770516a335 100644
--- a/src/script/calling/CallingRepository.ts
+++ b/src/script/calling/CallingRepository.ts
@@ -1236,8 +1236,8 @@ export class CallingRepository {
     conversationType: CONV_TYPE,
   ) => {
     const conversationId = this.parseQualifiedId(convId);
-    const conversationEntity = this.conversationState.findConversation(conversationId);
-    if (!conversationEntity) {
+    const conversation = this.conversationState.findConversation(conversationId);
+    if (!conversation) {
       return;
     }
     const storedCall = this.findCall(conversationId);
@@ -1246,13 +1246,13 @@ export class CallingRepository {
       // When a second call arrives in the same conversation, we need to clean that call first
       this.removeCall(storedCall);
     }
-    const canRing = !conversationEntity.showNotificationsNothing() && shouldRing && this.isReady;
+    const canRing = !conversation.showNotificationsNothing() && shouldRing && this.isReady;
     const selfParticipant = new Participant(this.selfUser, this.selfClientId);
     const isVideoCall = hasVideo ? CALL_TYPE.VIDEO : CALL_TYPE.NORMAL;
     const isMuted = Config.getConfig().FEATURE.CONFERENCE_AUTO_MUTE && conversationType === CONV_TYPE.CONFERENCE;
     const call = new Call(
       this.parseQualifiedId(userId),
-      conversationId,
+      conversation.qualifiedId,
       conversationType,
       selfParticipant,
       hasVideo ? CALL_TYPE.VIDEO : CALL_TYPE.NORMAL,
diff --git a/src/script/conversation/ClientMismatchUtil.ts b/src/script/conversation/ClientMismatchUtil.ts
index 9e3fc37a16c..821f4b61c99 100644
--- a/src/script/conversation/ClientMismatchUtil.ts
+++ b/src/script/conversation/ClientMismatchUtil.ts
@@ -55,14 +55,15 @@ type ClientDiff = {
 export function extractClientDiff(
   {deleted = {}, redundant = {}, missing = {}}: Partial<ClientMismatch> | Partial<MessageSendingStatus>,
   users?: User[],
+  defaultDomain: string = '',
 ): ClientDiff {
   const allDeleted = {...deleted, ...redundant} as QualifiedUserClients | UserClients;
   const deletedClients = isQualifiedUserClients(allDeleted)
     ? flattenQualifiedUserClients(allDeleted)
-    : flattenUserClients(allDeleted);
+    : flattenUserClients(allDeleted, defaultDomain);
   const missingClients = isQualifiedUserClients(missing)
     ? flattenQualifiedUserClients(missing)
-    : flattenUserClients(missing);
+    : flattenUserClients(missing, defaultDomain);
 
   const toClientDiff = ({userId, data}: {data: string[]; userId: QualifiedId}) => ({clients: data, userId});
 
diff --git a/src/script/conversation/ConversationRepository.ts b/src/script/conversation/ConversationRepository.ts
index 537066227b6..bc6839159cf 100644
--- a/src/script/conversation/ConversationRepository.ts
+++ b/src/script/conversation/ConversationRepository.ts
@@ -179,6 +179,7 @@ export class ConversationRepository {
       const {missingClients, deletedClients, emptyUsers, missingUserIds} = extractClientDiff(
         mismatch,
         conversation?.allUserEntities,
+        this.core.backendFeatures.federationEndpoints ? userState.self().domain : '',
       );
 
       if (conversation && missingUserIds.length) {
@@ -379,13 +380,20 @@ export class ConversationRepository {
     options: Partial<NewConversation> = {},
   ): Promise<Conversation | undefined> {
     const userIds = userEntities.map(user => user.qualifiedId);
+    const usersPayload = this.core.backendFeatures.federationEndpoints
+      ? {
+          qualified_users: userIds,
+          users: [] as string[],
+        }
+      : {
+          users: userIds.map(({id}) => id),
+        };
 
     let payload: NewConversation & {conversation_role: string} = {
       conversation_role: DefaultRole.WIRE_MEMBER,
       name: groupName,
-      qualified_users: this.core.backendFeatures.federationEndpoints ? userIds : undefined,
       receipt_mode: null,
-      users: userIds.map(({id}) => id),
+      ...usersPayload,
       ...options,
     };
 
diff --git a/src/script/conversation/MessageRepository.ts b/src/script/conversation/MessageRepository.ts
index 8d23eb5c595..bbec4428640 100644
--- a/src/script/conversation/MessageRepository.ts
+++ b/src/script/conversation/MessageRepository.ts
@@ -1071,10 +1071,10 @@ export class MessageRepository {
       UserRepository.CONFIG.MAXIMUM_TEAM_SIZE_BROADCAST,
     );
 
-    const recipients = users.reduce<UserClients>((recipientsIndex, userEntity) => {
-      recipientsIndex[userEntity.id] = userEntity.devices().map(clientEntity => clientEntity.id);
-      return recipientsIndex;
-    }, {});
+    const recipients = this.core.backendFeatures.federationEndpoints
+      ? this.createQualifiedRecipients(users)
+      : this.createRecipients(users);
+
     this.core.service!.broadcast.broadcastGenericMessage(genericMessage, recipients, false, mismatch => {
       this.onClientMismatch?.(mismatch);
     });
diff --git a/src/script/main/app.ts b/src/script/main/app.ts
index d290337e105..22fc4a67e28 100644
--- a/src/script/main/app.ts
+++ b/src/script/main/app.ts
@@ -408,7 +408,7 @@ class App {
       telemetry.timeStep(AppInitTimingsStep.RECEIVED_ACCESS_TOKEN);
       const {clientType} = await authRepository.init();
       const selfUser = await this.initiateSelfUser();
-      if (this.apiClient.backendFeatures.federationEndpoints) {
+      if (this.apiClient.backendFeatures.isFederated) {
         // Migrate all existing session to fully qualified ids (if need be)
         await migrateToQualifiedSessionIds(
           this.repository.storage.storageService.db.sessions,
diff --git a/yarn.lock b/yarn.lock
index abf25c68e33..2d9366fb5f0 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -2984,16 +2984,16 @@
   resolved "https://registry.yarnpkg.com/@wireapp/antiscroll-2/-/antiscroll-2-1.0.2.tgz#71a78d294ee0c88f42d50477ab61fa39272f5bca"
   integrity sha512-9KeB3yh9k01PjpuuRQsve4yY3+OVS2/hp9j+N13Is5wYCZRkUzZVCs8w9CyA/C6J5o9ukH0EzT7uurysWuhn/A==
 
-"@wireapp/api-client@18.2.0":
-  version "18.2.0"
-  resolved "https://registry.yarnpkg.com/@wireapp/api-client/-/api-client-18.2.0.tgz#943dc2092775951b4bf63695a04c92b74cd2dbf1"
-  integrity sha512-/zAdYX0B7wRaOlhigjCLf262jdzs57o8KAOGNc++ut+DJIRLwqcB4Zt6Ds2eTJvdnJgmhKPiONya+aCzuECUfg==
+"@wireapp/api-client@18.3.0":
+  version "18.3.0"
+  resolved "https://registry.yarnpkg.com/@wireapp/api-client/-/api-client-18.3.0.tgz#c9080c3a195564feee7a6664448b7b0f38c17490"
+  integrity sha512-qwNOM/4Qr5rq4+zFNp532IliNoa9vvVH9WEPX34C3gHLWrhjKXb0x/+Y4jWqVbAHgwAVKLys15ji+vNVrHPDQw==
   dependencies:
     "@types/node" "~14"
     "@types/spark-md5" "3.0.2"
     "@types/tough-cookie" "4.0.1"
     "@wireapp/commons" "4.2.13"
-    "@wireapp/priority-queue" "1.6.38"
+    "@wireapp/priority-queue" "1.6.39"
     "@wireapp/protocol-messaging" "1.37.0"
     axios "0.21.4"
     axios-retry "3.1.9"
@@ -3041,14 +3041,14 @@
     logdown "3.3.1"
     rimraf "3.0.2"
 
-"@wireapp/core@24.1.1":
-  version "24.1.1"
-  resolved "https://registry.yarnpkg.com/@wireapp/core/-/core-24.1.1.tgz#01ceba920d65bff0749f6447b4030df7832294ff"
-  integrity sha512-G5GQhtvp8NWExiIZ4w9PZ7GPXJDAop9Vhmo35Ug/1B97ccjYX//guPyrJ6RXd5mkUK0oMsQDWXbDtWb/m1GjDA==
+"@wireapp/core@24.2.0":
+  version "24.2.0"
+  resolved "https://registry.yarnpkg.com/@wireapp/core/-/core-24.2.0.tgz#f3bdb90c949d61ea41d20e569ff990f64206dea3"
+  integrity sha512-vf/FbGFZ0ojL5zGb9VahD2QR7xW7fs5HLh3NlVV+vHvLqH5lIXjGI068V8vz5Cq4GIrTwa13Gfwf97dK7UCDmA==
   dependencies:
     "@types/long" "4.0.1"
     "@types/node" "~14"
-    "@wireapp/api-client" "18.2.0"
+    "@wireapp/api-client" "18.3.0"
     "@wireapp/cryptobox" "12.7.1"
     bazinga64 "5.10.0"
     hash.js "1.1.7"
@@ -3092,10 +3092,10 @@
   dependencies:
     "@types/node" "~14"
 
-"@wireapp/priority-queue@1.6.38":
-  version "1.6.38"
-  resolved "https://registry.yarnpkg.com/@wireapp/priority-queue/-/priority-queue-1.6.38.tgz#7dfc4667a977e7075ca87f52fc3e7554419738f0"
-  integrity sha512-WZ6oMoI9wpg0N/kdytXxoVuibyKCQCmlJF2xejacL4O13spRyfQghMYA+4PuKJmSTezk/78TGfKBwnhS3nRa6w==
+"@wireapp/priority-queue@1.6.39":
+  version "1.6.39"
+  resolved "https://registry.yarnpkg.com/@wireapp/priority-queue/-/priority-queue-1.6.39.tgz#ebf887bc74ae1331bc9ad3612fcc7dcaf7e47e0c"
+  integrity sha512-Rsv0DixzhEwETALKEk0BRlQ4w0W2/oNtYpcTxpcCGOLZee9aqag3ETFo2LLnvGjCv14Q95FkGrzpvRT8yo2SVQ==
   dependencies:
     "@types/node" "~14"