Hello @jharris1993,
Welcome to the PayPal Community Forum! I'm sorry to hear you're running into some issues purchasing an aircraft on your Flight Simulator. Have you double-checked which preferred funding source is setup with this billing agreement to make sure it's the right one? If it's the right card, I'd make sure that Card is confirmed as well. After that, you may want to try cancelling any active billing agreements for this merchant and resetting it back up by attempting another in-game purchase. It's most likely the Microsoft billing agreement, but you should be able to find which one you would want to cancel by looking back in your history for the last time a purchase like this was successful.
I hope one of those tips do the trick, good luck!
- Jon K
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