As per the above posts Vinny @PlasticModels mate, update both your DJI Fly app and your firmware, DJI did away with all their authorisations last week: DJI updates its GEO Zone system and removes Unlock requests and NFZs from its Fly Safe platform
You can now fly a DJI wherever you like.
Just stay within the confines of The Drone and Model Aircraft Code, obviously 