Lost access to my account because of 2FA

I need help recovering access to my Meta Horizon/Meta account that I use with my Meta Quest 2 headset.

I am currently locked out of my Meta account because two-step verification (2FA) is enabled.

• Meta is asking me for an OTP/code sent to a phone number that I no longer have access to.
• I do not have my recovery/backup codes.
• I am not currently logged in to my Meta account on any device.
• I previously followed Meta's support instructions, which said to log out and then select an option such as "I no longer have access to this email".
• However, when I tried to follow that process, Meta told me that I needed to perform it from a device where I was already logged in.
• I therefore appear to be stuck in a recovery loop because I cannot log in, but Meta's recovery process requires me to already be logged in.
• When I try to contact Meta Support, it asks me to either log in to my account or provide an order number, and I may not have the order number available either.