The following URL breaks Edge Sync (passwords, bookmarks, history etc) as this is the URL for the sync server as confirmed when visiting edge://sync-internals/ in Edge and viewing the Server URL.
I've moved edge.activity.windows.com and edge-enterprise.activity.windows.com to the aggressive list. It will be in the next release. Thanks for the report!
The following URL breaks Edge Sync (passwords, bookmarks, history etc) as this is the URL for the sync server as confirmed when visiting edge://sync-internals/ in Edge and viewing the Server URL.
edge.activity.windows.com
Also discussed here on Microsoft website - https://docs.microsoft.com/en-us/deployedge/microsoft-edge-security-endpoints