Display Name

So, my Display Name elsewhere in Squarespace is just RightRon and all over the web for 30+ years and will be my author name in text on the site I'm planning to build.  To be told I can't use it in the Forum because it is someone else's name is disconcerting. I'm using the longer awkward email header. Can this be because I had a now cancelled account years ago?  Can that be corrected so I can again use my own name again? It will be seen that all my old information is unchanged now. Any remedy?

Ron Hufham aka RightRon