[A26B]

Try to remove the remaining bit still in the housing.
I have resolved problems like this by using a hacksaw blade to cut into the remaining band 2 or 3 places around. Then using a small chisel or center punch, drive the sections downwards & inwards away from the threads. If you cut into the female threads a little, no worries, just try not to go too deep with the hacksaw blade. Pipe threads are tapered, so you can chase the threads with a pipe tap just enough to clean them up. I suggest a couple of wraps with teflon tape on the new nipple.