Starting this morning, about 15-20 users started getting [this error message](https://imgur.com/a/CAqYmmP) when trying to log in to Skype for Business. Our health dashboard shows everything is fine. All affected users have S4B license features enabled and were able to log in just fine yesterday.
We’ve already cleared credentials from Skype and CredMan and tried logging in again to no avail. All affected users can still log in to portal.office.com just fine.
From the research I’ve done, this seems to point to an expired license, but that’s not the case. I’ve opened a support ticket with MS, but they’re slow to respond today and I was wondering if any of you have seen this before or have any ideas. Users are mostly all on Win10 machines (with a few Win7) and our environment is in Hybrid Mode, but there is no on-prem Skype server.