Actually I think what you described is a pretty common first reaction. When I put a harness on Zeus for the first time he hated it and just kept trying to get it off.
Try putting it on him, then distracting him. Feed him treats or pet him if he likes that so he has something to concentrate on other than the harness. Don't attach the leash yet. Let him wear the harness for a little while each day inside the house, maybe just for a few minutes at first, but as he gets more use to it he can wear it for longer and longer. Just make sure to neve leave it on him when your not around, in case it gets stuck on something and he can't escape. Once he's use to just the harness, you can attach the leash and at this point you should be able to take him outside with it.
With all that being said, I do think there are some bunnies that never get use to walking on a harness. I decided that I'm not going to take my Barnaby outside on a harness anymore because when he feels the leash pull, he gets really frightened.
If your rabbits is one of the ones who just can seem to get use to a harness and/or leash, you can let him have time outside by building him an outside cage, or using a pen. I built my rabbits an outside pen with NIC's and put them outside in that, so they can get fresh air and eat the grass.
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