Did you find any solution yet?
There are two different ways how to do it:
Lua Code:
EVENT_MANAGER:UnregisterForEvent("Notifications", EVENT_RAID_SCORE_NOTIFICATION_ADDED)
EVENT_MANAGER:UnregisterForEvent("Notifications", EVENT_RAID_SCORE_NOTIFICATION_REMOVED)
Lua Code:
local isDisabled = true
ZO_PreHook(NOTIFICATIONS["providers"][10], "pushUpdateCallback", function() return isDisabled end)