Hey all,
I'm having this same issue. It's a little more specific though so hopefully these details can be enough for someone to help me know where to look next.
I disconnected the battery, reconnected and normalized window/rear window/locks/moonroof. Then, I went to open the tailgate and it worked! But after it was open the motor made a little extra sound, and once I closed it, it made another little extra sound, and won't open again.
I recreated this exact same sequence a 2nd time. Got it to open once, but once it closes it's closed again for good unless I disconnect the battery again. Any tips...?