Chaning screen name difficulties

Hello!

I don't know if I have encoutered a bug or I'm jus out of luck here.

I'm trying to change my screen name and its becoming a nightmare. My screen name is currently my first name, a series of random numbers and ends with fcp (totally random for me anyway).

Of course I went to my profile and tried to change but whatever the name I pick, it doesn't let me.

A name with spaces? No. A name without spaces? No. My name + surname + my "Design" thing I use to have pretty much everywhere? No. My name + surname + "Design e Fotografia" which is basically a set of names I use to identify my "photography brand"? Hell no, has too many characters.

But the screen name change window doesn't tell me the requirements for the screen name, so I don't have a clue on what should I pick for it.

Thanks for the help!