I have a lamp with three hue bulbs and named them top, middle, bottom. I then have them in a group called living room. I had no problems with hue app setting them up and alexa discovering them. There was no difference between setting up a single lamp or a multiple bulb lamp.
Try setting the bulb you are having problems with in another light socket and then once it is set up, move it to the permanent location. it always could be a bad bulb