The default appears to behttps://iframe.ly . https://github.com/outline/outline/blob/9e9fedaff1e72f93f61ca752b80368dd1f0cdf1a/server/env.ts#L685 . But at the same time, the plugin manifest says both vars are required - https://github.com/outline/outline/blob/9e9fedaff1e72f93f61ca752b80368dd1f0cdf1a/plugins/iframely/plugin.json#L4 . Best to check upstream. Let us know what you find!

Wanted to note that the optionalSso change here allowed me to fix my Google Login issue, too! https://forum.cloudron.io/post/77654

Well spotted, I had done a search in there before posting but missed it. Thank you! And well, obviously that's a shame.

@girish I changed my domain to Porkbun, now it's working fine.

My bad... fixed.