PowerPoint Live Embedded streaming video do not play on some viewers

This never used to work and then it did but over the past two weeks it seems to work for some and not others. It is not whether you have joined a meeting through the App or Web which is the cause of some video playback issues. it must be something that teams have done to change it from working to not, it is really annoying as it should be a simple fix. Another annoying point is that animations do not work as well from presenting a power point from within teams. I know that you can share a desk top but then you loose viewing contact with the course attendees. All of this needs sorting ASAP. very frustrating!