Board Thread:Support Requests - Getting Started/@comment-219.74.129.241-20170206221520

I'm unable to register, it keeps telling me:

Username is taken or has invalid characters. Username can contain letters and numbers from one alphabet and must include one letter

So I thought I might've registered the nickname already and tried to retrieve password but then it says this: Hm, we don't recognize this name. Don't forget usernames are case sensitive.

What's going on?  