Will I lose access to alpha skip ahead program? If I change xbox one s to xbox one x for...

I believe you can re-enroll but I don't believe is guaranteed to be in Alpha still.

If I deregister the Xbox X out of the program, will it also deregister the Xbox One?

Originally the Xbox One was in Skip-A-Head Alpha. I purchased the Xbox One X, selected registration for Alpha Skip-A-Head, and it was automatically enrolled in the Alpha Skip-A-Head program.

I got the impression it is tied to the user who not the product. Hopefully someone in the program knows for sure.

I have this problem with Netflix for about 2 weeks on my xbox one x in Alpha skip ahead. Netflix on my xbox one in Alpha works fine at the moment.

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.

That's not how it works. You can move up in rings based on your activity in the program. Alpha and Alpha Skip-Ahead is by invite only, but those invites are sent by Microsoft. There's no way to ask for an invite. https://support.xbox.com/xbox-one/console/xbox-insider-program

I believe you can re-enroll but I don't believe is guaranteed to be in Alpha still.