I am trying to get SSL to work with WordPress on Openlitespeed.

So far, HTTP works fine, DNS verified and SSL generated on also. The HTTP domain part still works fine if I disable HTTPS re-writes. However, when I go to https, it will give me a 520 error.

Do I need to install a certificate also on openlitespeed? I am just a bit confused between the SSL certificates creates that just for the CDN part?

Any advice would be great, I know I am just missing something somewhere. I am using Ubuntu 20.04.3