Key for game pass pc not going through

I would just verify that it's a code to redeem directly with Microsoft. Sometimes there are specific instructions for those promotional pack ins not directly from Microsoft that require you to redeem the code at a different site to have the code sent to
you. A process like that would prevent the manufacturer from having to pay for more codes than people redeem saving them some money on the promotion.

If it is a 5x5 to be redeemed with Microsoft can you provide the exact error message you get when you try to enter the code?

You need ro call xbox support, as no on here can see your account or the code system

https://beta.support.xbox.com/contact-us

Sorry to hear it. Please try submitting the code at https://xbox.com/code to see if you're eligible for a replacement. If you are not then I'm afraid you would need to contact the place
you purchased the processor from for more help

I first redeemed it through a key I got as a present.

After it didn't work I additionally bought the game pass for pc (beta) which should have sufficed. I also added the gold upgrade for the ultimate version after the game pass didn't work too

You need to go through the game pass on PC to download these games or through the MS store

hope this helps