For some of our organization's videos on Microsoft Stream, attempting to play the video from a URL beginning www.microsoftstream.com results in an error code 0x20200259. However, if the user changes the url from www.microsoftstream.com to web.microsoftstream.com (for example, https://www.microsoftstream.com/video/[UUID] to https://web.microsoftstream.com/video/[UUID]), the video plays fine. Also, if the user clicks the embedded link to the video within Teams, the video plays in the embedded player. The "view in Microsoft Stream" link from Teams works as well, because that goes to the web.microsoftstream.com address.
These videos were recorded by Microsoft Teams and saved to Stream automatically.