Why my ID have limited character for form login in forsaken world steam ?

I have id from forsaken world mobile , but i want to play it too in steam platform for new ID binding

my id have limited character ,

this is my ID : elvinocybercafesolution at Gmail.com

the form login just only limited for 30 character , but my id for 33 character , i need more 3 character again

i have limited login character until gmail. only ... i must have 3 character again for write .com

this the picture for the case :

I hope GTarcade will adding for more 3 character , cause i want getting better gaming experience for my gaming PC ...

with love

Thanks a lot