my xbox game pass 3 month code won’t work

If you are talking about gamepass for console you need core or ultimate to play online

Gamepass for console is only access ro the games offline

Any online only games won't work without core or ultimatw

Hi Issac F! I hope you are well, delighted to be able to offer you my help!

Make sure you redeem on an account without an active Xbox Game Pass subscription. Accounts with an active subscription cannot redeem these trial codes. Note, Trial codes may not work if you previously had one of these subscriptions on this account.

If you have an active Game Pass subscription, it is impossible to redeem the code, let me know if this is your case.

Best regards,
Daniel.

That is not how it worked for me because I just converted to ultimate game pass and only got 3 months for my Xbox live subscription and 4 months of the Xbox game pass and pay for a year only?

i have an active 3 month game pass code activated on my console

A 3 month game pass code (or gold code] would convert to 2 months of ultimate.