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There are a few sites that won't accept this and won't even accept a Google Voice/VOIP number because they do some kind of check. Very frustrating.

Can you provide a number (i.e. POTS) that has no SMS capability?

What's the point of having a lock (OTP) if the lock is removed upon an attacker's request?

SMS is not two factor authentication, no matter what ISPs or websites tell you.

Actually it is a form of 2fa, might not be one you like but it’s better than 1fa or kba which is double single factor

Agreed. Although poor security with easy hijacking, it's still a form of 2FA. Even NIST doesn't recommend it as a factor to use for authentication.