Recipients can't click on "Review and Sign" link in the email they recieve

I created a new agremenet in Adobe Sign and sent it for signature. The email that was automatically sent to the signers has a blue ubtton that says "Review and Sign" but it's not a live link, nothing happens when you try to click the link. Any ideas? I have searched for an answer everywhere and also can't contact Adobe support.  Help! Thank you!