When you purchase and activate the Xbox Game Pass Ultimate Xbox Live Gold and Xbox Game Pass subscriptions are automatically updated.
Please note: when purchasing and activating an Ultimate subscription, existing Xbox Live Gold or Xbox Game Pass subscriptions are upgraded to Ultimate based on the conversion rate depending on the remaining days.
The conversion rate also applies to future code activations and is subject to change. Any transition to Ultimate is final: if you switch to this status, you will not be able to return to the previous one. The maximum validity of an activated Ultimate subscription offer per account is 36 months, including any transferred time from Xbox Live Gold and / or Xbox Game Pass (for PC or console).