This KB article suggests another approach that worked for me:
Note that you click (not right-click) on their avatar (at the top of the Board view) in order to get the pop-up menu with the "Remove from board..." choice.
It also works to click on the adjacent number-in-circle (Board Members list), and select the person from that list.
The quick fix does not work.
1) from board's guest members -list i can press the remove button, the user disappears. When refreshing the page the user is back in the list. Browser's dev console says "unauthorized permission requested" but the UI does not show any error messages
2) i can press add to team -button. The user is moved to team members -list. I can press the remove user button from there -> the user is back in guest members list.
I DONT WANT to pay any extra since this is buggy. I would purchase a license if this wouldn't be so buggy. Trello have been live like 10 years and I cant remove guest from my boards. I see that very big SECURITY RISK.
Please fix asap.
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