1. Check whether SSL is installed or not on your site.
Please open https://www.sslshopper.com/ssl-checker.html and enter your website. It will scan your site and give you the correct details on SSL. The scan will take 2 to 5 min.
2. Check the mixed content of the website.
Please open https://gf.dev/ and enter your website. This site will give your mixed content details.