How to manage autodiscover for Nexus365

Visit https://testconnectivity.microsoft.com/tests/exchange, select Outlook Connectivity
Set the test fields as follows:
Email address to test@unit.ox.ac.uk
Domain\User Name (or UPN) to test@ox.ac.uk
Password to test
Leave Use Autodiscover to detect server settings selected and review / tick the warning
Complete the anti-robot verification if required, then click Perform Test
The test will fail. Expand the test information to find a section for Autodiscover service using the HTTP redirect method. All tests under here should have a green tick, except for the final Autodiscover POST request test (red error)

Using Outlook for Windows (not New Outlook), hold Ctrl whilst you right click on the Outlook systray icon then select Test Email AutoConfiguration…
Set Email address to a valid University email address in the format firstname.lastname@unit.ox.ac.uk where unit.ox.ac.uk is the domain you want to test, and the associated mailbox can be accessed using an SSO that you own
Leave the password blank and clear the two Guesssmart options, then click Test
When prompted to choose a Microsoft account then select the relevant account if it is listed, otherwise click Use another account and sign in with your username in the format abcd1234@OX.AC.UK
After a few seconds you should see text in the Results tab, including the line Autoconfiguration found the following settings: which confirms that autodiscover is working correctly. If the line is not present then there is a problem with autodiscover for the domain of the preferred sender address of the account you used to test (it might be worth reviewing the results to make sure this is the domain you expected)

Autodiscover enables automatic configuration of University email accounts in Outlook using just the associated email address