Additional features, settings, or issues not covered by specific Microsoft Teams categories
Dear Laura_051,
Good day!
Thank you for posting to Microsoft Community. We are glad to assist!
Based on your description regarding "Microsoft Teams Room isn't certified error (Ver 5.2.115.0)". My sincerest apologies for the inconvenience this might be causing you, On further checks, looks like we have received a number of requests on this, and the team is currently looking in the situation.
Also, as an organization admin, you can also raise a service request to report this symptom to our online channel through the Microsoft Teams admin center. At the bottom-right side of the page, select Need help. A support agent can further connect with you remotely, for further troubleshooting and involve the backend team which might be needed for further checks. Get support for Microsoft 365 for business -- Online support.
I will also revert back when I get more info on this. Your patience and cooperation are much appreciated.
Best regards,
Inema |Community Moderator