I had to debug on a site of a friend with another account, but it's a bit tedious as all access checks happen on author level.
Issue fork activitypub-3506692
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Start within a Git clone of the project using the version control instructions.
Or, if you do not have SSH keys set up on git.drupalcode.org:
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Comment #4
swentel commentedDone
Comment #5
swentel commented