Why might reCAPTCHA not work on an IOS site?

Question

iOS

Good day, today I uploaded reCAPTCHA from Google to the authorization form on the site. On the desktop on Chrome, Mozilla and Safari (13.1.2) everything works, on the mobile it also works except for some Iphone users.

It turns out that on some Iphone models, when passing the captcha, the error "Unable to contact the reCAPTCHA service. Please check your Internet connection" occurs. I ruled out problems with the Internet almost immediately, as they checked from the same network. We began to find out the reason. At first, old versions of IOS (11 and below) were suspected, but after that they noticed such a problem on fresh versions, and the elderly seven, which had been lying in the bedside table for several years, calmly passed. Therefore, the logic of the occurrence of this error could not be identified.

Answer 1

99% that some cross-origin settings do not work correctly, since recaptcha pulls a bunch of everything over the network with javascript. If something did not channel through the cors, for the script it will just look like there is no connection.