Problem with Fruition - Notion Website

If so, I would recommend to take a look on the below articles and make sure Cloudflare is allowed to connect to your origin host/server:
https://support.cloudflare.com/hc/en-us/articles/201897700-Allowing-Cloudflare-IP-addresses

https://support.cloudflare.com/hc/en-us/articles/115003011431-Troubleshooting-Cloudflare-5XX-errors#522error