Unable to launch games I've launched before, Xcloud streaming not console streaming.

The Game Streaming with Project xCloud is supposed be coming to Windows 10 this year. I would assume/hope they will keep supporting the Xbox Console Companion for streaming until that is officially launched and available.

Interesting in theory & a great idea IF Microsoft pulls it off but given the awful launch of Stadia I reckon MS will test the waters with Xcloud before even thinking about a streaming only console.

You will be able to use this feature when xCloud launching. You will be able to streaming to other devices.

Also, there is an app for Android and iOS called Onecast, maybe you should try.

Your answer is not satisfactory since the issue is specifically with Xbox Series X and S so far as I've seen, which are systems that came out well after Mixer shut down. I have been streaming on Twitch through my Series X and even I cannot stream a single game now, every game states "this game does not allow streaming" including games I HAVE streamed in the past.

So there's something else going on that is not "we shut Mixer down over a year before this console launched"

...

It could be that Microsoft could be about to make us pay for a feature previously allowed for FREE!!...

You are confusing the xCloud service with streaming locally.

Xcloud allows you to stream games you do NOT own to your console. You basically "rent" access to the games which run on server hardware somewhere in the cloud, and stream the video feed to any device that supports xCloud. Be it your home console, your tablet,
smartphone or whatever. It's like Google's Stadia or what Sony does to bring backward compatibility to some Playstation games.

This is vastly different to the home streaming that allows you to stream the video feed from your console that plays the games you "own" to a device that supports local streaming.

Unless you are trying to allow thousands of people to access your own console from the internet to stream your games to them, you are not doing anything similar to xCloud.

So don't make up some crazy conspiration theory like "Microsoft is taking away our streaming, so we have to pay to use xCloud"