Would love to be able to synchronize from a master pihole to subordinate/slave piholes for configuration settings.
There is a third party app that does this.
Did you try Orbital-Sync?
(...)Orbital Sync's approach is designed to rely less on the servers running Pi-hole by instead acting on their admin interface just like you would.
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Gravity sync won't work for v6 though. Orbital sync I'm hoping will - in fact it should be much simpler given the changes to have a formal API.
Oribtal-Sync and Pi-Hole Teams should merge so Pi-Hole sync is native.