The solution was what I hinted in my comment. I am the administrator of our YouTrack server, and I used my email address for the "root" account, as well as my own user based on my username with the same email address. When I changed the email address of the βrootβ accounts to one of my colleagues, the commands ran correctly.
Now I would like to know how to solve this problem better, for example, disconnect "root" from the user search function, but this will be another problem. :-)
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