Old emails and AppleIDs linked to them
I've been using Mac for several decades. I've just bought and set up a new 2019/2020 iMac 21.5. The OS is Big Sur 11.4. There are also two MacBook Pros, two iPhones, and two iPads linked to me.
When I open the Apple icon at the top right corner on my system preferences page, it shows my current email (for over a dozen years now) as the AppleID user name, and a @me.com and an @icloud.com, both with the same etcili ID. Occassionally one of the last two show up in an AppleID query. I' tried to delete them, but the cumputer won't let me. Is there a way?