I'm unable to switch apple ID's on my iphone 7s
email in my apple ID that is about to become obsolete and need to switch my iphone 7s to my alternative email, the device will not allow me to make this change
iPhone 7 Plus, iOS 14
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Why not? What happens when. you try?
Note that what needs to happen is for you log out of the Apple ID on the iPhone, then update the email address associated with your Apple ID to a new email address. Then log in to the device with the updated Apple ID.
See here: link-> Change the email you use as your Apple ID - Apple Support
Note, that if your alternate email address is associated with our Apple ID as a secondary or rescue email it cannot be used as Primary for your Apple ID. You need an email address that has never been used with an Apple ID at all.
link-> What to do after you change your Apple ID or password - Apple Support