Can't play Game Pass Ultimate games with an active subscription.

Fortnite is a free-to-play game so we can play it on our device without having an active Live Gold or Game Pass Ultimate but if you will play it through cloud gaming, you will have to get an active Game Pass Ultimate. Since you don't have an active subscription, kindly try uninstalling and reinstalling the game and see if it works.

You can't convert it to Game Pass directly.

If you however have an active Game Pass ULTIMATE subscription (that combines Gold and Game Pass), the Gold membership card will add time to your Ultimate Membership.

However, since ULTIMATE combines two subscriptions, you won't get the full 3 months from the "Gold only" membership card.

According to the
Game Pass ULTIMATE FAQ page you will get 50 days of Game Pass ULTIMATE added to your subscription with a 3 month Gold prepaid card.

Hi, Kirsty! Thank you for reaching out.
I'm AJ, an Independent Advisor for the Xbox Community.
I'm sorry you are experiencing issues playing Disney Dreamlight Valley.

If you purchased or renewed Game Pass Ultimate while having an active 12-month subscription to Game Pass Core, your subscription should've converted to Game Pass Ultimate. Please note that this conversion is final and can't be reversed.

To clarify, did you cancel Xbox Game Pass Ultimate? Doing so would've also canceled your converted pre-paid time.

You can see your active subscriptions by signing in to your Microsoft Account at:
https://account.microsoft.com/services

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Disney Dreamlight Valley is still available through Game Pass Ultimate, Game Pass for PC, and Xbox Game Pass for console.

I believe the reason why you were unable to launch or redownload this game is that, if I'm understanding this correctly, you switched your subscription from Xbox Game Pass to Game Pass Core. Game Pass Core does not grant access to this game.

To play or redownload this game on an Xbox Console, you need an active subscription to Xbox Game Pass Ultimate or Xbox Game Pass for Console.

I'll be looking forward to your reply.
Best regards.

this is still half answered. I am at 17 tenure and want to keep it. I am somewhat weary of upgrading to ultimate game pass as there is nothing super clear about tenure

it seems there would be some kind of gap when going game pass ultimate -> Gold, as you can't convert back? or is it covered if i were to cancel game pass ultimate during a mid-month of active subscription, and same day/before end of active game pass ultimate
expires - add active gold sub??

I would also like to add that for the subscription you will need to have an active "Xbox Game Pass Core" or "Xbox Game Pass Ultimate" subscription in order to play online.*

Sorry.