Why can't I add someone as an admin with a ö (umlaut) in their name?

[da_arwin]

I'm trying to add my friend as an admin but whenever I enter the command to add him it says invalid group. The command works with other people though when I add them. So, I'm thinking its the ö (umlaut) in my friend's name. Any way of bypassing entering their name?

[jay209015]

You can try putting his name in quotes:
     ulx adduser "name" "group"
Or you can use:
        o adduserid <name> <group> <SteamID> [<immunity>] - Add a user by SteamID to specified group with optional immunity.