Issues with https

Hello, I’m having problems with some URLs, I’d like to know why the address below works with http but does not work with https

https://email.concurseiroprime.com.br/c/eJx1jksKwyAYhE9jdg1RYx4LF6Ul0GUDPcDvqzFETdVAj19zgMIshm_gYxQnuCMDqSzXojOESNW2StEGSyYKwMRgNhpstERt4yBH-61l8PKISdsY9midLsDVIlYLH6DHHYwwUqb0IFlLjcSMCaKFACVktfEl5z0hekVkKvmjOpeCQyolrxfwsNmUAdGC9-AQvUd1ez0fwc2hX9NnnqrIIYHPh9epPH07sNsp-wHWEkrs

Thats an non-proxied CNAME. Whatever SSL issue it is, it is not Cloudflare related. You need to contact whomever is responsible for the service you are pointing to.