Emby webhook sync rejects payload (Bad Request / invalid payload)

[Quick104]

Discord: https://discord.com/channels/1487838737248292864/1547193288811872316
Author: k18ldp

Goal

Create a webhook sync for Emby.

Steps

Followed setup instructions: Emby dashboard → Notifications → add Webhooks notification → paste Silo URL, set Request content type to application/json → enable listed events → save. Then Test Notification.

Expected

Test Notification works correctly.

Actual

Emby: Bad Request. Silo: Invalid Emby Webhook payload (Rejected invalid emby webhook payload).

What is slow/broken

Webhook connection for Emby (Jellyfin webhook on same setup works).

Scope

Emby webhook sync. Reproduced on Emby beta and non-beta (4.10.0.40). Maintainer note: built against Emby 4.9.5.0.

Version/branch

Build 562 · dc887b3

Deployment

Unraid via community templates

Technical notes

(none from reporter beyond screenshots in Discord thread)

[k18ldp]

Just a quick update - whilst this is still not working - but I did notice that when using a FQDN for Silo (eg silo.mydomain.com) then I do not get an error message in Emby when sending a test notification. - however the test notification is not received by Silo.