Unable to create a PAT in project

Hi Gitlab Experts!!
I’m facing an issue when creating a personal access token in the project. When I try to create it, I receive the error message: ‘Failed to create a new access token: A user, alias, or group already exists with that username.’
there are no users, groups with the username.
Similar issue i found in the gitlab forum but there is no solution or workaround for this issue.
Reference link : An attacker can deny to create new access tokens on any groups or projects (#383216) · Issues · GitLab.org / GitLab · GitLab

I tried to reproduce the issue with the help of the above link but couldn’t solve the issue, need help here to create PAT tokens in my project.