Old apple ID
I cant remember an old Apple ID which keep popping up making it so I cant do anything on my phone. As soon as I cancel the pop-up it disappears the email to this ID is invalid.
iPhone XR, iOS 12
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A request for another Apple ID password is often caused by updates to apps/purchases that were made when using the other ID. Those purchases are tied to the other ID and can't be transferred. One option is to delete the apps/purchases made by the other ID and download them using the new ID if desired. If necessary, check your purchases history to see which apps/purchases weren’t made by the current ID.