Try rocking the stuck part up and down and side to side. One of the reasons I got the kickr bike was to experiment with bike fit. I must put a lot of weight on the bars, because the horizontal bar the stem is attached to always is stuck inside the main top piece and unable to move, unless I’m readjusting on the same day. Brute force doesn’t help, but rocking and wiggling the front piece always loosens things up. I don’t have this issue with moving the seat forward and back, but I don’t mess with that measurement much.
@CraigM I did a combination of both. I go my son to assist and did just as you suggested. It wouldn’t move, wouldn’t move, wouldn’t move … and finally it jumped out. I lubed it a bit and was able to get it to move in and out a bit. I got it set to where I needed it. Thanks!