AD group is not synced to O365

Hello Centrify experts,

We use AD groups to provide O365 licenses to our users. I mean that in Centrify Admin Portal – Roles – Office 365 – Members page I put an AD group, not individual users. It usually works fine but yesterday I got strange issue with this. Some users were unable to login to their O365 apps. O365 portal shows those users as ‘unlicensed’… Looks like AD group is not synced to O365 anymore. I have quickly fixed it by manually adding individual users to Centrify Admin Portal – Roles – Office 365 – Members page.

How can I troubleshoot this issue?

Thanks for your help.