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https://nishantrana.me/2019/12/25/lookup-filter-error-notifications-territory-entity-enhancements-in-dynamics-365-for-sales-customer-service-2019-release-wave-2-unified-interface/
Lookup Filter, Error Notifications, Territory entity enhancements in Dynamics 365 for Sales / Customer Service – 2019 Release Wave 2 (Unified Interface)