DS record not_found_ds_record mixed content and https status

I used the diagnostics tool and a couple of issues came up:

Check DS record configuration

not_found_ds_record
The hostname has no DS records.
**Not sure how to resolve that issue. The link to “resolve issue” takes me to my dashboard, but that is all. Not sure what is next.

Check the HTTPS status

Does the site respond with a succesful HTTPS status?
**I have added a rule so that everything redirects to https://. Checked source code of pages and all paths are https:// nothing is HTTP:// so I’m not sure how to solve that one.

Check the site for mixed content

Does the website mix encrypted and non-encrypted content?
response_non_200
The site’s web server responded with a status code that isn’t 200 (OK).
**With the rule in place, I’m not sure why this is coming up.