Hashtag and numbers with Username change

I'm tryna change username, i presently don't have any numbers and hashtag in my username, all i need to do is take away the area in my username. there are individuals who have the identical title with numbers and hashtags on the finish however i can't discover anybody with out. when i preview the title change on the xbox web site it doesn't have any hashtags.

It says when you see an ID subsequent to your gamertag blah blah. however does that imply i gained't have numbers as they aren't there within the preview or they may simply seem after i modify my gamertag? as stated there are individuals who have the title with hashtags already however can't discover anybody with out