Call of Duty: Modern Warfare 3 won't let me put in a clan tag

It doesn't matter what I put, the letter A, the number 9, CAT, nothing.  Everything I put in there says it's prohibited.  Anyone have any idea how to fix this?

 

Question Info


Last updated July 4, 2018 Views 3 Applies to:

Try clearing your cache. This is a problem for @ATVIAssist on twitter though not really an Xbox live problem.

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