Apple ID and Password constantly rejected even after resetting both.
I have an iPhone 5s and need to update Apps via App Store which always rejects my ID and password, even after several resets of the same and even though the ID and Passwords are always accepted when on another iPhone , two iPads and an iMac PC on the same account. What do I need to do please to make sure the ID and Password works on my iPhone like it does on the other appliances ?
iMac, iOS 10, Sierra