Notifications to sign into itunes won't stop popping up on my new iphone 7. How do i make it go away?

Notifications to sign into itunes won't stop popping up on my new iphone 7 even though I signed in already, and now it keeps saying its incorrect while I'm still signed in. It refuses to go away so I'm unable to actually do anything on my phone. How do i make it go away?

Go to a computer and change your Apple ID password. Use the new password on the phone.

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