Cannot change Gamertag

I try changing my Gamertag to a name, it says it's available. ITS NoT TAKEN,but every time I try to change it, I get the status code: 8015303 Please help.
 

Question Info


Last updated July 4, 2018 Views 13 Applies to:

Gamertags are used for more than service in Microsoft.  Even though it's not being used for Xbox it could be used for another service such as Xbox Music or internally.

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Wouldn't it say this Gamertag is currently in use?

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80154303 is the code

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I can't find anything on the code but the system wouldn't tell you if the code is in use somewhere else.  

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