Cannot Claim Xbox All Access On Xbox Series X

I think the "Bought Xbox Seres X" in the title answers the platform question.

The OP has bought a Series X via All Access but cannot achieve the initial activation of Ultimate Game Pass

OP: Might want to check this thread out:

https://answers.microsoft.com/en-us/xbox/forum/all/new-series-x-on-all-access-error-when-trying-to/

Depending on where you bought it from, you may need to contact LiftForward or Klarna. Sometimes it seems that retailers aren't sorting it out properly and so the UGP ends up being processed separately and thus not connected to the console (Walmart especially)

If you don't trust the retailers, you'll never get an Xbox series x anytime soon.

I stay in the UK and one of those retailers has the Xbox series s and x available but you have to take it with Xbox all access to pay the console off over 2 years.

This retailer is the probably the only one autherised by Microsoft to sell the Xbox series s/x via Xbox all access in the UK.

Same here.

I upgraded from the ultimate pass on Xbox one X to the series X but it won't let me claim it on the series X.

Also Tetris connected won't open either.

An Xbox series X comes with All Access, So I have to wait 2 years if I wanted the full benefits of All Access?

The All Access is so you can get an Xbox One now and then upgrade to a Series X when it's released basically. So you wouldn't get the option to purchase the Series X yet.