In the test environment, the videos are displayed and can be played, in the Teams channel they are ignored without an error message
It's not a bug. Teams support playback of media within an Adaptive card, but only if the media is hosted in OneDrive or SharePoint. Media hosted anywhere else is not supported today.
Can you try this and let me know if you are still facing the issue.
I have the same issue. How do I report a bug?
could you open a support ticket? That seems like a bug to me
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