Are game subscription codes stackable?

Apparently they are 30 days non stackable gamepass ultimate codes so only work if you have no current subscription.

no it shows purchases and current subscription

when the current subscription expires the next one applies as it is stackable

[quote user="Mad Cow Dizease"]

Beware that 'trial' codes (ie 48 hour codes) are not stackable.

[/quote]

Just 48 hr trial codes aren't stackable, or all trial codes (i.e., 7 day and 14 day trials)?

Beware that 'trial' codes (ie 48 hour codes) are not stackable.

You can redeem it now or later, it will still work regardless. The old Gold cards will still work, they will automatically become Game Pass Core.

Subscriptions are stackable upto 36 months. If you redeem your code now it will increase your sub to 15 months and will automically change to Game Pass core in September.