First it was 12char now 15,but what character isnt allowed in this tag??? This is on the...

If you don't have access to a 360, then you're limited to the 12 character limit. There is no way around that.

even if i add numbers on the end it still says that the gamer tag isnt allowed.

Hi there SLCE_grizzly65,

Thanks for reaching out here in Xbox Forums. I understand there is an issue with

changing a gamer tag. In reference to your question, No special symbols, punctuation or accented characters are allowed. It has to be 15 characters or less.

Hope this helps.

If you can change it on a 360, you should still be able to use the old system that allowed 15 characters. Otherwise, there is no way to make it longer unless Microsoft changes the policy again in the future. The limit was shortened to make room for the sugfix that is added when people use the same tag.

"It just doesn’t make sense. 15 characters allows more variation"

Yes, it does make sense, and No,15 characters doesn't allow more variation.

Do the math, after understanding the numerous reasons outlined in the link provided earlier.