If the email button is not working, you probably don't have a default email setup.
Set Email up as Default:
Steps for Chrome
Steps for Firefox
Steps for Safari
That email button copies your email url and puts it into an email for you. You could simply copy the link and then paste it into an email and it will do the same thing.
As long as someone knows your url they can check into your room.
If you are still having issues after trying these steps, contact our support team.