https://thenextweb.com/scooters/2020/08/05/apple-wants-to-make-2fa-safer-with-domain-bound-sms-codes/

Authenticating transactions or login sessions through SMS-based two-factor authentication is standard practice. However, SMS as a 2FA medium might not be totally secure. Hackers can intercept these messages and use them to log in to your account.

Apple is trying to make this method a tad bit more secure through domain-bound messages for developers. Make no mistake, the company’s new effort is trying to improve autofill — a function that lets you automatically put received code in the field.