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OK I might have answered my own question. Its likely that the numbers provided to you are VOIP numbers and not "real" numbers.
WhatsApp will not let you use a VOIP number to sign up for their service. Its likely Facebook will not send a code to a VOIP number as well.
Kind of a bummer. I just want to argue with chuds on my local page without giving Facebook my soul lol.
Out of curiosity, is it hard or impractical for you to get a second phone number where you live?
Over here phones with multiple SIMs are common, pretty much everybody has one with dual physical SIM or with eSIM support.
You can also get a cheap prepay plan that will let you receive verification SMS for extended periods of time.
That would be more then I'm willing to spend. I'm basically trying to get around their human verification process. The first thing they demand is a phone number to receive a OTP.
What I did find was a service called smspool.net that let's you order a non-voip number to receive a OTP for around $0.25. You can rent a phone number if you want but I was able to get the OTP and get through the appeal process.
https://kycnot.me/search?q=sms&type=
You can use any of these services.
If you want to debug, take the phone number you're getting from relay, and go over to twilio and look up that phone number. See if it's attached to a voip service. Many SMS authentication services simply refuse to send a message to a VoIP number
This is why service providers, like in the directory above, exist to provide non-voip phone number access online.