diff --git a/src/containerapp/HISTORY.rst b/src/containerapp/HISTORY.rst
index b5b55085ee3..ad688317c31 100644
--- a/src/containerapp/HISTORY.rst
+++ b/src/containerapp/HISTORY.rst
@@ -5,6 +5,9 @@ Release History
 
 Upcoming
 ++++++
+
+0.3.34
+++++++
 * 'az containerapp job execution show/list': improve table output format
 * 'az containerapp create/update': --yaml support properties for api-version 2023-04-01-preview (e.g. subPath, mountOptions)
 * 'az containerapp service': add support for creation and deletion of kafka
@@ -13,6 +16,7 @@ Upcoming
 * Add regex to fix validation for containerapp name
 * Add 'az containerapp ingress cors' for CORS support
 * 'az container app env create/update': support --enable-mtls parameter
+* 'az containerapp up': fix issue where --repo throws KeyError
 
 0.3.33
 ++++++
diff --git a/src/containerapp/azext_containerapp/_clients.py b/src/containerapp/azext_containerapp/_clients.py
index 6300c88f75a..e2642b97303 100644
--- a/src/containerapp/azext_containerapp/_clients.py
+++ b/src/containerapp/azext_containerapp/_clients.py
@@ -1226,6 +1226,34 @@ def delete(cls, cmd, resource_group_name, name, headers, no_wait=False):
                 logger.warning('Containerapp github action successfully deleted')
         return
 
+    @classmethod
+    def get_workflow_name(cls, cmd, repo, branch_name, container_app_name, token):
+        # Fetch files in the .github/workflows folder using the GitHub API
+        # https://docs.github.com/en/rest/repos/contents#get-repository-content
+        workflows_folder_name = ".github/workflows"
+        url_fmt = "{}/repos/{}/contents/{}?ref={}"
+        request_url = url_fmt.format(
+            "https://api.github.com",
+            repo,
+            workflows_folder_name,
+            branch_name)
+
+        import re
+        try:
+            headers = ["Authorization=Bearer {}".format(token)]
+            r = send_raw_request(cmd.cli_ctx, "GET", request_url, headers=headers)
+            if r.status_code == 200:
+                r_json = r.json()
+
+                # See if any workflow file matches the expected naming pattern (including either .yml or .yaml)
+                workflow_file = [x for x in r_json if x["name"].startswith(container_app_name) and re.match(r'.*AutoDeployTrigger.*\.y.?ml', x["name"])]
+                if len(workflow_file) == 1:
+                    return workflow_file[0]["name"].replace(".yaml", "").replace(".yml", "")
+        except:  # pylint: disable=bare-except
+            pass
+
+        return None
+
 
 class DaprComponentClient():
     @classmethod
diff --git a/src/containerapp/azext_containerapp/_params.py b/src/containerapp/azext_containerapp/_params.py
index 2cbe101d496..05f5b7d8068 100644
--- a/src/containerapp/azext_containerapp/_params.py
+++ b/src/containerapp/azext_containerapp/_params.py
@@ -255,6 +255,7 @@ def load_arguments(self, _):
         c.argument('service_principal_client_secret', help='The service principal client secret.')
         c.argument('service_principal_tenant_id', help='The service principal tenant ID.')
         c.argument('image', options_list=['--image', '-i'], help="Container image name that the Github Action should use. Defaults to the Container App name.")
+        c.ignore('trigger_existing_workflow')
 
     with self.argument_context('containerapp github-action delete') as c:
         c.argument('token', help='A Personal Access Token with write access to the specified repository. For more information: https://help.github.com/en/github/authenticating-to-github/creating-a-personal-access-token-for-the-command-line')
diff --git a/src/containerapp/azext_containerapp/_up_utils.py b/src/containerapp/azext_containerapp/_up_utils.py
index 69cd5df1104..8a984251efc 100644
--- a/src/containerapp/azext_containerapp/_up_utils.py
+++ b/src/containerapp/azext_containerapp/_up_utils.py
@@ -45,7 +45,6 @@
     repo_url_to_name,
     get_container_app_if_exists,
     get_containerapps_job_if_exists,
-    trigger_workflow,
     _ensure_location_allowed,
     register_provider_if_needed,
     validate_environment_location,
@@ -1041,14 +1040,6 @@ def _create_github_action(
         service_principal_tenant_id,
     ) = sp
 
-    # need to trigger the workflow manually if it already exists (performing an update)
-    try:
-        action = GitHubActionClient.show(cmd=app.cmd, resource_group_name=app.resource_group.name, name=app.name)
-        if action:
-            trigger_workflow(token, repo, action["properties"]["githubActionConfiguration"]["workflowName"], branch)
-    except:  # pylint: disable=bare-except
-        pass
-
     create_or_update_github_action(
         cmd=app.cmd,
         name=app.name,
@@ -1065,6 +1056,7 @@ def _create_github_action(
         service_principal_tenant_id=service_principal_tenant_id,
         image=app.image,
         context_path=context_path,
+        trigger_existing_workflow=True,
     )
 
 
diff --git a/src/containerapp/azext_containerapp/custom.py b/src/containerapp/azext_containerapp/custom.py
index 681919139d6..6d5a5fb4b7d 100644
--- a/src/containerapp/azext_containerapp/custom.py
+++ b/src/containerapp/azext_containerapp/custom.py
@@ -92,7 +92,7 @@
                      check_managed_cert_name_availability, prepare_managed_certificate_envelop,
                      get_default_workload_profile_name_from_env, get_default_workload_profiles, ensure_workload_profile_supported, _generate_secret_volume_name,
                      parse_service_bindings, get_linker_client, check_unique_bindings,
-                     get_current_mariner_tags, patchable_check, get_pack_exec_path, is_docker_running, AppType)
+                     get_current_mariner_tags, patchable_check, get_pack_exec_path, is_docker_running, trigger_workflow, AppType)
 from ._validators import validate_create, validate_revision_suffix
 from ._ssh_utils import (SSH_DEFAULT_ENCODING, WebSocketConnection, read_ssh, get_stdin_writer, SSH_CTRL_C_MSG,
                          SSH_BACKUP_ENCODING)
@@ -2765,6 +2765,7 @@ def create_or_update_github_action(cmd,
                                    service_principal_client_id=None,
                                    service_principal_client_secret=None,
                                    service_principal_tenant_id=None,
+                                   trigger_existing_workflow=False,
                                    no_wait=False):
     if not token and not login_with_github:
         raise_missing_token_suggestion()
@@ -2789,6 +2790,16 @@ def create_or_update_github_action(cmd,
             raise RequiredArgumentMissingError('Service principal client ID, secret and tenant ID are required to add github actions for the first time. Please create one using the command \"az ad sp create-for-rbac --name {{name}} --role contributor --scopes /subscriptions/{{subscription}}/resourceGroups/{{resourceGroup}} --sdk-auth\"') from ex
         source_control_info = SourceControlModel
 
+    # Need to trigger the workflow manually if it already exists (performing an update)
+    try:
+        workflow_name = GitHubActionClient.get_workflow_name(cmd=cmd, repo=repo, branch_name=branch, container_app_name=name, token=token)
+        if workflow_name is not None:
+            if trigger_existing_workflow:
+                trigger_workflow(token, repo, workflow_name, branch)
+            return source_control_info
+    except:  # pylint: disable=bare-except
+        pass
+
     source_control_info["properties"]["repoUrl"] = repo_url
     source_control_info["properties"]["branch"] = branch
 
@@ -2834,7 +2845,20 @@ def create_or_update_github_action(cmd,
         logger.warning("Creating Github action...")
         r = GitHubActionClient.create_or_update(cmd=cmd, resource_group_name=resource_group_name, name=name, github_action_envelope=source_control_info, headers=headers, no_wait=no_wait)
         if not no_wait:
-            await_github_action(token, repo, r["properties"]["githubActionConfiguration"]["workflowName"])
+            WORKFLOW_POLL_RETRY = 3
+            WORKFLOW_POLL_SLEEP = 10
+
+            # Poll for the workflow file just created (may take up to 30s)
+            for _ in range(0, WORKFLOW_POLL_RETRY):
+                time.sleep(WORKFLOW_POLL_SLEEP)
+                workflow_name = GitHubActionClient.get_workflow_name(cmd=cmd, repo=repo, branch_name=branch, container_app_name=name, token=token)
+                if workflow_name is not None:
+                    await_github_action(token, repo, workflow_name)
+                    return r
+
+            raise ValidationError(
+                "Failed to find workflow file for Container App '{}' in .github/workflow folder for repo '{}'. ".format(name, repo) +
+                "If this file was removed, please use the 'az containerapp github-action delete' command to disconnect the removed workflow file connection.")
         return r
     except Exception as e:
         handle_raw_exception(e)
diff --git a/src/containerapp/setup.py b/src/containerapp/setup.py
index 32ae102c998..665335575e2 100644
--- a/src/containerapp/setup.py
+++ b/src/containerapp/setup.py
@@ -28,7 +28,7 @@
 # TODO: Confirm this is the right version number you want and it matches your
 # HISTORY.rst entry.
 
-VERSION = '0.3.33'
+VERSION = '0.3.34'
 
 # The full list of classifiers is available at
 # https://pypi.python.org/pypi?%3Aaction=list_classifiers