Ok
Resolved for me 🙂
Minimum username length? Not a problem.
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I tried to change my username to S - It says username too short
Then I put S (with 3 spaces) - It works. lol XDCan this be considered a bug?
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I think it will when @ mentions will be involved
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Fixed on master thanks for reporting.
https://github.com/NodeBB/NodeBB/issues/3820