In the last few days the Build Automation integration with Discord has added broken share links on the messages, the URL is giving the an error 502: Error: Server Error.
It appears the problem is because the Discord share links points to the old https://developer.cloud.unity3d.com URL, changing the URL to the new https://cloud.unity.com/public/build-automation/ appears to work just fine.
From other forum posts, this appears to be an issue with other message integrations as well.