SSL Integration

website: [login to view URL] , SSL certificate purchased from Comodo and installed. Htpps website opening on desktop but Mobile site is not working. It's giving an error stating that the certificate is not from a trusted source. The screenshot is attached for your reference. Checked with Comodo & [login to view URL] support center. Gave same resolution: SSL chain order for your domain: [login to view URL] is missing/incorrect. So that the SSL certificate is not working on some browser/android. I need assistance in implementing the chain certificate so the Mobile site also works with SSL (https)