I have 6 domains on CloudFlare and I just noticed that two of them are set to SSL/TLS > OVERVIEW > FLEXIBLE and not FULL.
When I change them they return:
Error 525 Ray ID: 56336f114e8671e3 • 2020-02-11 04:03:35 UTC
SSL handshake failed
All of my other sites (www.ElectricCadi.com, www.MyCeliacWorld.com and others) are fine with FULL. All are the same WordPress build and none have their own cert (which I thought was a requirement for FULL, but apparently it not).
I read a few other posts on the subject but did not find an answer beyond, this is a problem with your host which does not help me very much