I think i'm in the same boat with you.
Inside Quest 2 i get message about "additional authentication needed, continue purchase on PC or Oculus App on mobile" or something like that.
When i go to my PC and try to purchase any app or game from Oculus store i get message "Something went wrong during authentication. Try again later"
In Oculus App on Android it just says "Something went wrong. Try again later"
Tried adding several credit cards to Oculus payment options.
All cards are working for example in Amazon purchases.
Adding payment methods work fine, no problems there.
But simply cannot buy any app or game.
Oculus support just repeats "try uninstalling Oculus app and reinstalling it"
If none of these steps work and you are still having issues with trying to purchase digital content, please send us a private message so we can further investigate the issue for you. Please click here https://ocul.us/OculusCommunitySupport or on our name to get to our profile page, then click "Send a Message" to privately contact us. Please remember, you must be signed into the community first to send us a private message.
Same situation here.
I have a ticket going on with Oculus support and we are trying to solve this.
At the moment looks like there might be some issue with PSD2 verification between Oculus Apps Store and some banks.
My bank has verified that my credit card is functioning as it should and there are no restrictions on the card.
Oculus App Store is asking for PSD2 verification when adding payment option, but is not asking for PSD2 when purchasing apps. And i think this is a problem that prevents purchasing apps or games from Oculus App Store.
This PSD2 verification is an EU thing to prevent misuse of credit cards.
Oculus support suggested trying Paypal but i don't have Paypal account and will not be creating one.