Hey there, @A-Person- ! We know it can be pretty concerning to not be able to access your Facebook account due to 2FA issues. We'd love to point you in the right direction!
We do want to advise, as this is more closely related to gaining access to your Facebook account. The best option we could provide for now, would be the following link below to the Facebook Help Center which will be of further assistance on this issue.
I was in the same situation and couldn't use my Quest 2 for 24 hours. It turns out that i had an Authenticator set as authentication method in my Facebook Account. I started my Google Authenticator on my phone and my six pin number was there.
The authentication window in the Meta Quest 2 should be updated to stop induce that you're supposed to "receive" a code.