Azure容器应用部署失败：Identity操作BadRequest错误求助

此前通过GitHub Actions部署Azure容器应用一切正常，今日更新部署时失败，同时Docker推送到容器注册表、手动部署也无法正常执行。

GitHub Actions报错信息 #

ERROR: (FailedIdentityOperation) Identity operation for resource '/subscriptions/SUB_ID/resourceGroups/NAME/providers/Microsoft.App/containerApps/backend-prod-app' failed with error 'Failed to perform resource identity operation. Status: 'BadRequest'. Response: '{"error":{"code":"BadRequest","message":"DelegatedResources dictionary cannot be empty unless resource has existing delegations."}}'.'.

手动部署报错信息 #

Failed to deploy new revision: Identity operation for resource '/subscriptions/SUBS_ID/resourceGroups/NAME/prov….. prod-app' failed with error 'Failed to perform resource identity operation. Status: 'BadRequest'. Response: '["error":("code" :"BadRequest", "message". "Client not permitted to perform resource delegation. Requests containing delegated Resources must be made with a valid Microsoft 1st-party app credential."))'.

已尝试重新创建容器应用，但问题仍未解决，恳请协助排查。

内容的提问来源于stack exchange，提问作者kenkyusha