When you try to use a flash on a camera hotshoe, it has to be set to "listen" for signals on the hotshoe, and that means being out of any off-camera slave modes. That tells the flash to ignore any signals on the hotshoe, and to listen to either an optical sensor (if it's an optical slave mode) or the internal RF receiver (if it's in a radio slave mode on a flash that has this your Neewer doesn't). This means that your flash is in a slave mode. The only mode which is working is the wireless one where flash is triggered by in-camera flash.
It's absolutely impossible for the center pin of the flash to touch anything but the center pin on the hotshoe due to the guide-rails. Also to note, I use these accessories on my Canon all the time and it also has the 4 extra pins for TTL and I don't need to tape those of. Under suspicion that this was shorting the other 4 pins, I tried taping them off but the problem did not change. It also has a plastic base instead of metal. Looking at the bottom of the adapter, it has a much larger center pin with a substantially larger diameter than both the flash and the radio trigger. When I use the adapter, the flash and radio trigger fire no problem. The adapter I have is a LumoPro Universal Hot Shoe Adapter II (not sold anymore, replaced by JJC Standard Hot Shoe Adapter).
Then I tried putting a hotshoe adapter on the camera and attaching the flash and trigger to the adapter. I couldn't get either the flash or the radio trigger to fire directly on the camera, despite all the flash settings etc. In my case, I was trying to fire a Yongnuo YN560-III and a RadioPopper JRx, the first is a low-voltage flash the second is a low-voltage radio trigger. I experienced this exact issue on my EM10-iii and it turned out to be mechanical in nature.
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