Link Apple ID
how to fix music app when it says “this device must be linked to your Apple ID to play content saved offline. This device is already linked and can not be transferred for 90 days
iPhone XS Max, iOS 13
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If you are trying to link it to another Apple ID, contact iTunes Support to see if they can waive the 90 day period. Either use the form or scroll to the bottom of the page in the 2nd link. Follow through the screens to get a chat or telephone option.