AZ900 Cert- Phone number filling issue

Well, I have also faced this kind of issue, and if any of you know how to solve the issue, please let me know.
Update: I managed to pass the phone number registration only with the help of one of phone number online services. For some reason, my own phone number was not accepted by the system, so I tried to use the phone emulation services, and it worked perfectly. After the registration process, I managed to change the emulated phone number to the correct one. If any of you need help with fixing the issue, let me know in private messages.Update: I managed to pass the phone number registration only with help of the one of phone number online services. For some reason, my own phone number was not accepted by the system so I tried to use the phone emulation services, and it worked perfectly. After the registration process, I managed to change emulated phone number to the correct one. If any of you will need help with fixing the issue, let me know in private messages.