AZ900 Cert- Phone number filling issue

I had a similar issue when trying to register for the AZ-900 certification. I tried multiple combinations—country code, city, mobile number—but nothing worked. I was almost out of options, but then I found a solution.

I used a service that provides temporary numbers. It allows you to receive SMS online in the UK for registration purposes. Try this approach: select the country you need (e.g., the UK), use a temporary number, and you should get the code. Another advantage of this method is that you avoid unnecessary spam on your real number. Hope this helps!