I use e-Junkie's Webhook Integration and noticed after enabling Cloudflare's Super Bot Mode to challenge possible bad bots, that we are now getting email notifications that e-Junkie is currently unable to notify our server.
After looking at our WAF events in Cloudflare, ASN AS14618 AMAZON-AES with IP 52.54.0.16 seems to be the culprit. Once we disabled Super Bot Mode the issue went away. I'm assuming the only way to bypass this issue is to set up a Firewall rule on my end that allows that specific ASN to go through unchallenged.