Hi @Vitaliy Marchenko ,
Welcome to Atlassian community.
Did you check if the user actually exists in the system? I could easily reproduce this issue by trying to add a non-existent user xyz.
User xyz could not be found. Please confirm their existence with a Confluence Administrator.
The username displayed on screenshot also seems to be incorrect. Check and try again. You can find list of users by following the article
I hope the above information helps. Have a good day.
Thanks,
Srinath T
Also, the username seems to be like userid. Make sure you are adding by username.
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I have the same problem.. and I am an Administrator. Annoying bug.
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