After installing the app "GitLab for Jira (gitlab.example.com)" in Jira Cloud according to the explanation "Install the application manually" in GitLab.com for Jira Cloud app | GitLab it is not possible to connect Jira Cloud and GitLab.
The connection is done as following, and worked till ~ june of 2023:
In Jira Cloud go to "Apps --> Manage your Apps --> GitLab for Jira (gitlab.example.com) --> Get started" resulting in this page:

After clicking the "Sign in to GitLab"-Button and authenticating in the popup, this error is displayed:

Any help appreciated
Kind Regards
David