Same issue on Quest 2 with the Walking Dead Saints & Sinners. I can purchase other games but not this one, so it has nothing to do with payment method or pin code. I have also checked that I have enough space on my device.
Same Issue here. Trying to purchase something during the big Lunar Sale but receive this error. Chatted in to support but they were not helpful at all and said there are no known issues with the store. The agent did say something interesting "It looks like a lot of people are also trying to purchase what you are trying to purchase. That might have something to do with it" and they hinted at a maximum amount of people that can take advantage of the sale price. Frustrating to miss out on the sale and not have any verbiage on the store about only a certain amount of purchases are allowed on a given app during a sale.