Accessing Microsoft Teams Free using personal or organizational credentials
Greetings!
This is Tin, sorry to hear that you're unable to signup an account due to the "prove you're a human" page error. Have you tried to use other browser and check if the issue persists? Or how about clearing cache and cookies? To do that, please press CTRL +SHIFT +DEL then choose the Cache also Cookies, then hit Clear Now. If the issue persists, please try to use other device. And if it's still the same.
Please let me know how it goes.
Thanks,
Tin