I had this problem last night. The feed gears were not fully engaged (v,w,x,y lever). Jiggle the levelers for the feed to ensure they are engaged. If they won’t go in, try moving them while twisting the feed shaft (the smooth one) to get it to go into gear.
Don’t neglect to the directional control lever; it has engagement faults too. If the threading screw rod revolves, then the auxiliary transmission is working and it is just a matter of the setting levers being engaged.
Separately, the screw is for threading. One of the shafts with keyway operates both power feeds. Also, if the half nut lever for threading is not fully disengaged, the power feed lever will move, but not far enough to engage the power feed.