As I explained here, after I did this, the site was offline. So, I was unable to see the outcome of that. But when I tried the same setup on a test sub-domain, all was working fine. Therefore, I suspect there is something wrong with the SSL.
Based on your clue of www, I changed the host address, and the issue was fixed immediately.
I also suspect that the site may have gone offline because of Cloudflare’s recent service outage.
Anyway, it got fixed.
Thank you!