user8963
Known around here
all inbound ports are blocked, all Dahua domains associated with P2P are blocked in PiHole and only allow outbound ports for email and notifications.
you have to allow apple ports for push notifications in firewall..
If your Apple devices aren't getting Apple push notifications - Apple Support
Learn what to do if your Apple devices don’t see Apple push notifications when connected to a network.
support.apple.com
but sure .. if it worked before its mostly dmss/dahua problem