KMail setup for outlook.com - "Failed to process EWS request"

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Hi folks, I’m trying to add my Outlook.com account for mail, contacts and calendar and I’m struggling to get past the error Failed to process EWS request - HTTP code 401.

I’ve been following the Kmail documentation for Office 365 including the workaround to supply some “dummy” credentials in the username/password section before choosing OAuth2.

This worked successfully for a different Office 365 account. However when I try this for my Outlook.com account it successfully goes through the OAuth2/MS Authenticator flow then fails with the below dialog box.

I’m using Kmail Version 5.22.3 (22.12.3) from Debian bookworm. Does anyone have any ideas? Cheers!

Note that IMAP works but it’s not the solution I’m going for here. I want to sync KAddressBook and KOrganizer too.

ews_setup_outlook
ews_setup_outlook926×1236 107 KB

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I can at least partially answer my own question: it’s possible to use the Username/Password option here using an App Password created through MS account settings.

Domain: outlook.com
Username: my.full.email@outlook.com
Password: app_password_goes_here

It’s now syncing mailboxes through EWS. Sadly no luck yet with calendar/contacts; I keep getting notifications that an akonadi process is crashing while traversing the resources on my account. I don’t know for sure whether this would work better with OAuth2 but I suspect it’s a separate issue.