I Registered for XCloud streaming preview and I'm also an insider so I hope to get to also...

I am really excited for both. I'm registered to participate in the xcloud beta but I've also pre-ordered Stadia to try out the service. I was a part of project stream when it was in beta, and I absolutely loved my time with it, so I'm excited for the future.

"So I deleted all consoles registered in the Insider app, I deleted the app, downloaded it again, but now I have no consoles registered in Insider app, still no option for console streaming in Xbox settings. "

You must have at least one console registered in a Insider preview ring as at this time Streaming is only available to Insiders for the purpose of testing functionality.

Check this Xbox Game Streaming (preview) support wiki on the XBox
Insiders Forum for more details.

Downloading the insider app doesn't gaurantee that you will be included in the preview. You have to interact with other people in the insider hub and hope you are picked. Your best option for streaming games on your phone would be to sign up for project
xcloud which is basically a game limited version of its console streaming counterpart

"So I deleted all consoles registered in the Insider app, I deleted the app, downloaded it again, but now I have no consoles registered in Insider app, still no option for console streaming in Xbox settings. "

You must have at least one console registered in a Insider preview ring as at this time Streaming is only available to Insiders for the purpose of testing functionality.

Check this Xbox Game Streaming (preview) support wiki on the XBox
Insiders Forum for more details.

You saved my life of gamer, thnk you so much 👍👍👍

Project xCloud and the Streaming Preview was only originally available to those who signed up to test it in advance a few weeks ago. As of right now the streaming preview is only for Xbox Insiders who are in either one of the Alpha previews. i don't believe
it has trickled down to the Beta ring yet, and it will most likely leave its preview stages before it trickles down to the other rings in the Insider Program. By then, the Game Streaming preview will most likely be running in bigger test sessions.

You can learn more about it here.

https://www.xbox.com/en-US/xbox-game-streaming