Can't create a username for Stellaris Multiplayer

[JayPeezy]

So basically it says every username already exists when some of the ones I've entered couldn't possibly exist, i.e. a random stream of letters about 15 characters long.

Normally I have my username as JayPeezy in every game, I've tried every permutation of that with numbers after to the point where I tried... J_P_Z_300390W12..... Which is also taken... And it couldn't possibly be taken unless someone has the same initials, birthday and postcode as me...

Can someone help please?

 

[AndrewT]

This is the GoG version, is that right? Because I don't think any other version asks for MP usernames.