Apple Mail doesn't work with icloud.com address
About 90 days ago, I changed my Apple ID from a yahoo.com.au address to my icloud.com address. I'd never used Apple Mail before, so I thought I'd give it a whirl, but much to my frustration, I can't get it connect.
When I turn on connection logging, the log file has the name imap.mail.yahoo.com[deleted].txt, and the diagnostics inside seem to suggest that I'm trying to connect to imap.mail.yahoo.com using my new icloud.com address! This is happening even though I've deleted the old yahoo.com.au address from my accounts. See attached screenshots of the 'Internet Accounts' window of 'System Preferences' and 'Mail' - 'Preferences' - 'Accounts'.
Is there anyplace else that the old yahoo.com[.au] address might be lurking that I need to delete?
Thanks.
iMac 21.5″, macOS 10.15