I am trying to delete some git repositories on Azure DevOps.

The repository names contain brackets. Here is an example for a name: Repo XY (Abandoned).

Repositories without brackets in their name can be deleted with no issues. However, as soon as there are brackets in the name, I get following error:

TFS.WebApi.Exception: TF401019: The Git repository with name or identifier 
123456789 does not exist or you do not have permissions for the operation
you are attempting.

I also have this warning in repositories that have brackets in their name:

Advanced Security status for this repository can't be retrieved right now. 
Support has been notified. Please try again after a few minutes.

This warning is not shown for repositories without brackets in their name within the same project and I also can delete these repositories without brackets within the same project (no errors).

I have this issue across two individual projects.

According to this page, brackets are not restricted characters: / : * ? " < > ; # $ * { } , + = [ ] |. So I am confused why this only happens to repositories that have brackets in their names.