After monitoring the situation for reoccurrence of original issue, we are ready to resolve this issue as cleared.
Cloudflare has said a fix has been implemented and they are monitoring the issue. We are going to continue to monitor our sign-ins to confirm that everything is working as expected.
Cloudflare is currently having an issue where some users are unable to complete the managed challenge to be able to login to Syncro. You can follow along on the issue here: https://www.cloudflarestatus.com/incidents/sn6z3zf2yb1z