In Microsoft Stream, you share a video to an external or Azure Business to Business user. When the user tries to access the video, they see the following error message:
This video isn't available.
There's something wrong with the video ID for this page.
This error occurs because Stream can't currently share to external users. This includes Azure Business to Business users.
To work around this issue, store the video in another location. For example, add the video to a SharePoint Online or OneDrive for Business Library location that enables external sharing, and then share the video to the external users.