Can't join the T.R.D.S Beta or the Rushmore - Xbox insiders hub.

To become an insider, download the Xbox Insider Hub app on your console. You join through the app. After that, you can join various betas.

I did some digging and as far as I could tell, the beta/demo period for T.R.D.S (Totally Reliable Delivery Service) may have actually ended on account of the game launching sometime around the end of this week/the beginning of next.

I'm in the Alpha Skip-Ahead ring on the Insiders program and I no longer have access to the demo/beta through the Insider Hub. It doesn't show up as a joined or an available demo/beta. It still shows up in my ready to install, but all betas/demos will until
they're officially removed from the store if they are at all because joining the demo/beta grants the code for it to your account as a 'purchase.' I, however, can no longer play it even when installed.

You could try to get at the Insider Team on Twitter as well online: https://twitter.com/xboxinsider

The Twitter page said there were playtests available for the weekend (03/20 to 03/22), so the most likely scenario is that it has concluded and was just for the weekend.

i already reinstalled the game yet it still in the beta and on the xbox insider hub it says "join"

Have the same problem. Unenrolled from beta testing in Xbox Insider Hub. Restarted. Reinstalled Minecraft. Open Minecraft. Is beta. Uninstalled Minecraft, waited 24hrs, restarted. Installed Minecraft from store. Still beta. Have multiple licenses of this
game to play it with my kids who are under 13 and thus cannot join the Insider hub. I can't use the beta version to play with them so this is keeping me from enjoying this game. please fix.

Good day

I missed understood your question, my apology.

Thought you wanted to get beta on mobile phone.

Taken from Mojang website.

XBOX ONE / WINDOWS 10

You will need to own the digital version of the game. For the beta, disc owners are not supported - sorry!

Joining the Minecraft Beta on Windows 10 or Xbox One:

1. Go to the Store app on Xbox One or a Windows 10 PC.

2. Search for the Xbox Insider Hub app.

3. Download and install Xbox Insider Hub.

4. Launch the Xbox Insider Hub.

5. Navigate to Insider content > Minecraft Beta.

6. Select Join.

7. Have fun and find bugs!

Found on Mojang website.