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Makes a lot of sense.
Thanks @luckow
Yes, I have seen the question that @BrutalBirdie posted at https://help.univention.com/t/restrict-username-allowed-characters/17280 as well. But no, I am not aware of a way to limit characters with the ucs self registration.
This has been fixed now with https://git.cloudron.io/cloudron/box/commit/2bde023d4dc783761553a0a7be88650e5885b4ad and should be part of the next release.
