Xbox Game Pass AMD product?

I have the following question:
I got a RX 590 Graka, got a code for Xbox Game pass 3 months. If the code should be entered on Amdrewards, then download the verification tool, enter it again, it went through. How or where can I get the Xbox code for 3 months? The code was apparently only for the verification of the hardware? And ne email or similar I didn't get it afterwards, just a confirmation of registration.

The code is then on the website.