If for some reason your site's timezone is invalid, and the timezone selection field is not enabled per user, you can't create new users or update any existing users whose timezone is NULL. This is not unexpected but the error contains no useful information for debugging: "The value you selected is not a valid choice" and there is no error in the form.
In my case we migrated from a site that had a custom timezone set ('Australia/Canberra') and this setting was migrated to the new site. But since this timezone doesn't exist, all users were migrated with a NULL timezone and new users could not be created.
This is fixed very easily by setting a valid timezone, and the issue doesn't occur even with an invalid timezone if 'Users may set their own timezone' is selected.
This is such an edge case that I'm not even sure whether it should be fixed but I thought I would make the issue in case it helps someone else.
configurable: falseconfigurable: trueCatch this error and provide useful feedback about it.
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Closed: won't fix
10.1 ✨
Last updated
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It's likely this issue predates Contrib.social: some issue and comment data are missing.
Marking this won't fix on myself, I think it's been long enough! Given that this can only occur with invalid configuration, I don't think it needs to be addressed. But still the report may help someone someday :)