Hello
Have you tried to login with different AAD account or other Microsoft Account?
This will help us to narrow down whether the issue is related to the specific account.
Or try to backup to AAD with another pc using the same account.
If the issue only occurred with the specific account, we may ask for help from the AAD administrator.
"80072ee7" means “The server name or address could not be resolved”. It could be a dns issue or network issue. Please try different network may be useful.