Unable to receive SMS for Meta Developer verification

Hi all, 

I am trying to register as meta developer, according to this guide:
https://developers.facebook.com/docs/development/register

However, I never receive the verification SMS, no matter what I try. Here's what I've already done:

• Tried multiple phone numbers with Czech +420 prefix, from different mobile operators

• Added and removed phone numbers across all my Meta, Instagram, and Facebook accounts

Nothing worked so far. If anyone has any suggestions or has faced the same issue, I’d really appreciate your help.

Thanks in advance!