Issue Converting From Game Pass Ultimate To Xbox Live Gold

In short, once you have converted to Game Pass Ultimate, your Xbox Live Gold will be converted to Game Pass Ultimate. If you cancel, you will lose that converted Xbox Live Gold.

Once you activated the Game Pass Ultimate your Xbox Live Gold was converted to Game Pass Ultimate time. If you cancelled Game Pass Ultimate, then you lose your Xbox Live Gold that was converted.

If You Get Game Pass Ultimate It Will Convert Your Xbox Live Gold 1 Year Into Game Pass Ultimate For The Remaining Time Left On Your Year Subscription. So For Example If You Have Xbox Live Gold Paid For A Year And You Upgrade To Game Pass Ultimate It Will Convert It To One Year Game Pass Ultimate Or However Many Months You Have Left Of Your Subscription.

(Make Sure It Says Upgrade To Game Pass Ultimate So It Will Convert Your Gold To Game Pass)

Unfortunately you would have to purchase gold again if that is what you want. Before purchasing the promotion, you are warned that whatever gold or regular game pass you have on your account will be converted to Ultimate Game Pass and cannot be converted
back.

Xbox Game Pass Ultimate:

Use your active Xbox Game Pass Ultimate membership to play games on Xbox One and Windows 10 PC. Xbox Game Pass Ultimate includes Xbox Game Pass for Console, Xbox Game Pass for PC, Xbox Live Gold and additional benefits. Note: Purchase of Xbox Game Pass Ultimate
automatically upgrades your existing Xbox Live Gold or Xbox Game Pass membership(s) to Xbox Game Pass Ultimate at a conversion ratio each based on days remaining. Learn how this works at www.xbox.com/gamepass. Future code redemptions are also subject to a
conversion ratio. Conversion ratio subject to change. All conversions to Xbox Game Pass Ultimate are final: Once converted, you cannot re-convert your Xbox Game Pass Ultimate membership back to a previous membership. Maximum 36 months of redeemed Xbox Game
Pass Ultimate per account at a time, including any converted time from Xbox Live Gold and/or Xbox Game Pass (for PC or console).

If you check out this link https://www.xbox.com/en-US/xbox-game-pass in the FAQs it explains how they convert your Xbox Live Gold to Xbox Game Pass Ultimate and also
details the conversion rate of days Gold left on your subscription, to days of Xbox Game Pass Ultimate.

It also explains that when you converty you Gold, you can't then convert back from Ultimate.