Cannot update macOS Apps - wrong Apple ID email
I have 2 updates pending on each of 2 Macs. Apple ID request email address is different email from current ID. I cannot get additional Apple ID as I cannot change ID email address to different (Active) Apple ID - request returns ‘address not available.
If I could switch to working Apple ID. All would be OK. Running macOS 10.13.2
How can I do this?