Full SSL 404 error

Hello
I am using wordpress.
When I switch to full SSL on cloudflare then I get 404 error on my main domain www.example.com but on subdomain that is sub.example.com it does not show any error?

What is causing this error and how to fix it?
My other domains on cloudflare does not show this error

Your server does not appear to be properly configured for HTTPS with a valid certificate. You need to make sure it is and might want to contact your host about that.

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