Outlook indexing stopped

Hi,

We're using Outlook 365 in our organization.

One my colleague installed windows 11 on his laptop.

I don't know what happened but he reported Outlook indexing issue.

We checked and indexing is stopped and not starting automatically.

We tried index rebuilding, profile rebuilding in registry, check windows search setup but no luck.

He's getting frustrated cause he cannot see the new emails.

Is teher any idea what we can do?

We did all of these steps:
https://www.youtube.com/watch?v=c0KCr5wIl1Q

Thanks

Tamas