Done it! 365 and Outlook can now send from two domains
From Sara Merriman@21:1/5 to All on Sat Feb 4 00:43:26 2023
What a palaver. In case anyone else ever wants to run two domains on 365 and use Outlook on a Mac:
Turn off New Outlook
Go to Settings and add a new account with the second domain
It will not authenticate
Click on Not 365?
Choose Exchange Account
Autodiscover authentication won't work
Sign in manually, setting the DOMAIN\username as the primary domain in 365
Do not turn New Outlook on again or it will refuse to authenticate and won't connect to the non-primary domain
(In Mail.app I added the address and It Just Worked).
Next job: do the same exercise on iOS...
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Billy is silly