Problem Definition

Auto-merge will not automatically merge between a branch pair that has an open pull request i.e., auto-merge expects to be the only thing that is merging between release branches.
OR
Due to merge conflicts from previous pull requests and auto-merge attempt.

After which all new Pull request will not attempt to auto-merge.

Users and admins need to know when auto-merge fails and why so it can be addressed quickly.

Suggested Solution

1. Provide better logging to identify the problem.
2. Provide a notification in the UI

Workaround

Review all branches related to the cascading merge and resolve any open pull requests or merge conflicts.