Xbox insider tweeted and said they've rolled out streaming to omega, but it still says it's...

They rolled out to the Xbox Insiders Alpha users, as for the rest of us that are Beta, Delta, Omega, or General Public, they have not been released yet.

It's still rolling out so at some point you'll get it on your Series S.

Only if you are in a Insider preview ring! ASA, Alpha, Beta, Delta or Omega.

There has been no notification that the new dashboard has been released to GA.

As far as the tv they've said it's initially available in the US and will be rolled out to the rest of the world gradually.

Hi, I tried to private message you but it didn't work.

You have to be in the insider preview to download the avatar beta app. It works on the original Xbox One, the Xbox One S and Xbox One X. It is not rolled out by console model but by which Insider Preview ring you are in. It has now been rolled out to all
rings.

Insider Preview has Alpha Skip Ahead, Alpha, Beta, Delta and Omega rings. Alpha Skip Ahead and Alpha are invite only from the development team. You can use any Xbox One family of console in any of the rings.

Quote.."I just enrolled for the Insider, because i hoped that in the omega release it would not be a problem. Unfortunately it is still there . But i can definately say, that I had this problem even when i was not part of the Insider Programm. "
Unquote

As stated previously, use the Report-a-Problem feature you now should have as you joined the Omega ring of Insiders Preview.

Long press the Nexus button and choose the option. The more info the developers get the better.

XBox Insiders Forum