Apple ID is not Valid
I wanted to have a new iCloud email address on my iMac. I created it using my computer system preferences.
I successfully created an email address and Its name eg. 'xxxxxx@icloud.com'
I used it for 2-3 days as I remember.
After 2-3 days when I open my computer the below message appeared.
I tried with my password but didn't work. I tried with forgot password also. Didn't work
Mac Pro, macOS 11.4