Hi recently bought a Polaroid smart tv but I am unable to sign in to my google account through the browser or the google app that appears when you open smart tv when I put in my email/ password details the page refreshes and take me back to email log in,I also get a message saying this page has mixed content can anyone advise thanks

Hi recently bought a Polaroid smart tv but I am unable to sign in to my google account through the browser or the google app that appears when you open smart tv when I put in my email/ password details the page refreshes and take me back to email log in,I also get a message saying this page has mixed content can anyone advise thanks