Can't click "I am not a Robot" on Facebook in app browser (Android)

[Odin]

Greetings,

I have a very specific use case in which the recaptcha is not working.

Our signup form is promoted through a facebook post. However, users that click the post are guided to the signup page inside the facebook app and can't click the "I am not a robot" checkbox.

It works fine on any a pc with every major browser

It works fine on any android machine if the webpage is accessed directly through a browser

It works fine on any iPhone running the facebook app, even while staying inside the iPhone facebook in app browser.

Javascript seems to be running as the javascript validation works as intended on the rest of the fields. It is only the recaptcha that does not work.

Not trying to advertise, but linking so people can test this themselves:

Facebook page: https://www.facebook.com/ClioGlobal/ (its the first post about learning English)

The signup form: https://account.clio.me/int/signup which works from a browser, but not if accessed through the native android facebook app

Any help is greatly appreciated