Processes in Microsoft 365 for setting up Office apps, redeeming product keys, and activating licenses.
Dear Ted,
Good day! Thank you for posting your query in our community.
Based on your description, when users try to open the Stream video in MS Forms, an error pops up. I tested it on my side with different accounts, the result was the same as yours.
Since we can reproduce the same situation as yours, and we haven't received any report about it so far, the best way to troubleshoot the issue is to report the issue to the related Team. So we suggest you contact the administrators in your organizations and open a support ticket in the Office 365 admin center via the steps in the article for further help. The engineers in related team have higher permission and more resource than us to help check it from background and collect the log remotely.
Your understanding and patience will be highly appreciated.
Sincerely,
Jazlyn | Microsoft Community Moderator