Service tag being denied as “profanity”

Games Halo: The Master Chief Collection
1

I’m trying to change my service tag to “469” but it keeps denying it saying not to use profanity. What gives?

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> 2533275066838068;1:
> I’m trying to change my service tag to “469” but it keeps denying it saying not to use profanity. What gives?

This is an old bug that I’ve experienced when naming maps. Although the problem’s not permanent, the solution to it is kinda vague.
Try hard-rebooting your Xbox or PC and change the tag again. If this doesn’t work, try again in a few days. It’s happened to me multiple times, but it has never persisted for too long.