I want to say that a failed solenoid won't cause the vehicle to not move. That is basically true, but one thing that I considered is whether you didn't have the solenoid in all the way. I've never made that mistake, so I can't say from experience what would happen, but it seems plausible that if the solenoid popped out, all of the fluid pressure could be rapidly leaking out of that port on the valve body, which would prevent clutch engagement and therefore, no movement from transmission.
I am leaning on that, because that's where you were working. There is nothing else outside the transmission that can prevent transmission movement, whatever is wrong, it's inside the trans, not outside (it's not wiring, computer, anything like that).
If the solenoid is where it belongs and OK, it's also possible that some debris remained in there from doing the job, it got caught up in the gears of the pump, and broke the pump drive shaft. I've done that before, and when the pump drive shaft breaks, the transmission simply quits working. These are the two things I'd be looking at. Both require removal of the side cover, but it seems you already know how to do that. That's where you need to go looking.