Asana integration stopped working on gitlab.com

We are using gitlab.com (free account) with Asana integration. This integration appears to have stopped working recently. Commit messages with #<asana_issue_num> no longer appear in Asana. I’ve tried to replace the API key by creating a new one on Asana but for now avail. Clicking “Save and Testing Settings” doesn’t provide any feedback therefore it’s hard to say whether the issue in on GitLab or Asana side.

Has anyone encountered this issue in the past few weeks?

We are using a local installation of gitlab and the synchronization seemed to stop working a few days ago (maybe about a week?)
According to the “test and save settings” in the gitlab UI, everything seems fine, but messages aren’t pushed anymore.
Did you find any solution to this problem?