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So when you took the filter out, you most likely have a incorrectly installed o ring on the filter (3:55 in the video). This allows the air to get sucked in instead of pulling fluid thru the filter giving you no movement. Pretty common mistake and worth check before doing anything else.
Double check the connections at the transfer box shift motor. This message can be caused by a few things. I would recommend having some look at this with Land Rover experience. Do you have any diagnostic equipment available?