I have no idea why CF thinks they can get away with this stuff. Now, interestingly enough, I’m also getting SSL errors, though not sure whether I need a certificate before setting up Office 365; guess I’ll have to learn that later on; every other instance of Office 365 and Cloudflare I have had in the past, the SSL side of it was always handled by someone else in my group. Said group kinda doesn’t exist anymore, so I’m playing catch up, I think. Fun.