I have the exact same problem. SO frustrating for my son which just bought a brand new Quest 2. Oculus support keep asking me to log in and out and send all kinds of personal information and haven't heard back from them for days now.
Their site gives the "This content is blocked" in the confirm purchase step when buying The Walking Dead, although he was able to buy Beat Saber a day prior to that.
When I look in the developer console log in the Chrome browser it shows the following error:

I suspect it's something to do with the new european banking rules, which here in Denmark involves some integration with our national identity system (NemId). But why was he then able to buy Beat Saber just fine?