How to make appointment of iphone13 of Macau

I have a phone number of china mainland.

On the official appointment website. The underline sentence told me that i could use mainland phone number to make appointment before i buy it in Macau.

The question is that i can't receive verification message from apple and i can't change area number 853 to mainland area number 086.

So how to use china mainland phone number to make appointment to buy a iPhone in macau