Upgrade Game Pass Console to Game Pass Ultimate.

Hi there,

I bought and redeemed a code for 3 months of xbox game pass yesterday from a third party site, I redeemed the code and it worked fine but I didn't realise it was standard game pass rather than game pass ultimate. I was
wondering if there was a way to upgrade without having to pay the full price of an ultimate subscription since I already have game pass, it's just the 'gold' bit that I need.

Thanks in advance.

:)