iCloud does not sink with mac mail
I have two iCloud accounts. One dates back to the old @me.com days. That one has a dot in it. The newer one came about when they changed the name to iCloud. That one does not have the dot. Two areas in which I am having trouble in my new 16 inch mac is syncing the calendar and Mac Mail. When I go into system preferences I go to accounts iCloud. Both accounts appear. When I try to add calendar or mail it asks for my iCloud account when I put in the name of either account it says "You cannot change your account name". I am not trying to change the name. I was just entering it because it asked for it in order to add Mac mail and calendar.
MacBook Pro 16″, macOS 12.1