i changed my apple ID but my iphone and apple watch are still showing old ID and won't accept my password
I had to change my apple ID due to my work email now longer being acceptable to use as my ID. I updated my apple ID to a new email address using my computer however my IPhone and apple watch are still showing my old email address as my ID and now won't accept my password (i get an error message saying unknown error occurred" How do I get my phone and watch to update to new ID?
iPhone 11, iOS 15