I remember my old ID info, Apple doesn't.
I've always tracked my logins. A lot of my music won't play because "This computer is not authorized", from an old Apple ID. I don't have that email, anymore (so I cannot Reset by Email). When I provide the CORRECT answers to the security questions (birthday is OK, of course), it doesn't accept the answers. Frustrating!
iMac 27″, macOS 10.13