Idk

Hi,

If you've registered for the beta via this link here you should be able to get a code within a couple of days within registering on the site and the code can be found
here. When you get the code, and redeemed it on the console it gives you access to a demo application you need to run on the console.
It should be named "Pre-Release Console Registration Application", if you've already redeemed the key but just haven't downloaded the application you should be able to re-download it easily by going to XBOX 360 Dashboard > Settings > Account > Download History.

Once it's downloaded, hit Play Now and go through the steps of registering the application. Once you reach the last step that's it, your part is done now you just have to patiently wait. It can take upwards of 3 business days for you to receive
the dashboard beta update (business days are considered Monday-Friday, you do not count the day you ran the registration application, nor do you count Saturday/Sunday are those are not business days).

After you've received the update to your console within another 3 business days or so you should receive access to the beta dashboard private forums where you can post your feedback and bugs, that can be found here.
Please refrain from posting any feedback on the public forums as clicking this link now will only result in you getting an error message "GROUP NOT FOUND" so please be patient .

xcl.xbox.com/beta but the site is having problems at the moment so you can't access it.

Hello Nice, My name is Jesse. I'm an Independent Advisor and a member of the Microsoft community and I'd love to assist you today.

Could you please provide more information on the issue?

Sign in by your email ask for a new connection because you lost your code

That is a billing issue, phone Xbox Support and they will be able to help you.