Error adding http security headers

Ive added the following security headers to two of my wordpress sites. One works with https://hstspreload.org/ the other doesn't.

lazulu.com passed. resistfromday1.org> failed: > Error: Cannot connect using TLS We cannot connect to https://resistfromday1.com using TLS ("Get https://resistfromday1.com: remote error: internal error").

Both wordpress, php7, redis

Any idea what the problem might be?

Thanks