<!--IssueSummary start--> <details> <summary> Everyone can contribute. [Help move this issue forward](https://handbook.gitlab.com/handbook/marketing/developer-relations/contributor-success/community-contributors-workflows/#contributor-links) while earning points, leveling up and collecting rewards. </summary> - [Work on this issue](https://contributors.gitlab.com/manage-issue?action=work&projectId=278964&issueIid=481940) - [Close this issue](https://contributors.gitlab.com/manage-issue?action=close&projectId=278964&issueIid=481940) </details> <!--IssueSummary end--> From https://gitlab.com/gitlab-org/manage/import-and-integrate/discussions/-/issues/112#note_2076937556: As an admin, I can go to the instance settings > Users and I'll see the placeholder users appear in the list. While the possibility to impersonate a placeholder user is deactivated/disabled, there's an option to create an `Impersonation Token`.  Although the API appears to deny internal users https://gitlab.com/gitlab-org/manage/import-and-integrate/discussions/-/issues/112#note_2077999694 we should remove the ability to create an impersonation tokens for internal users as a defence in depth measure.