Special Chars in Usernames

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Per default, both WordPress and IPS have no issues with special chars in usernames. Some WordPress installs may have strict mode enabled (e.g. through WordPress Network or WPMU Feature) which results in ASCII based names only.

Some users may find this free WordPress plugin useful: WordPress Special Characters in Usernames

Nevertheless, if this plugin doesn't fix your issue, it has a very lean codebase, so you may just copy, adjust and past it into your theme's functions.php or a custom plugin to get it solved in your scenario.

Please note that this inconsistent use of strict mode in WordPress has a bugtracker discussion since 2011, so that's nothing we can hurry up here.

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