Icemaker not working

Started the replacement of the existing dual outlet valve by removing cardboard covering the lower back of the refrigerator exposing the outlet valve. Closed the water supply valve at the wall. Removed the hose bibb water supply connection on the outlet valve by hand as it is only hand-tight. I used a small plastic container to catch the minimal amount of water left in the copper line. I removed the electrical connection on each solenoid valve (one for the in-door water supply and one for the icemaker supply). I removed the plastic supply lines from the outlet valve. I removed the screws on the bracket attaching the dual outlet valve to the refrigerator vertical rail. I reconnected the electrical connectors to the valve. I reattached the plastic supply lines to the valve, but did not tighten them fully at this point. I secured the bracket on the new valve to the existing screwholes on the refrigerator rail. The new outlet valve does not have a hose bibb connector, it has a compression fitting for the supply. I reused the existing copper supply line from the wall angle-stop valve to reconnect to the new outlet valve. (It would have been best to have cut the copper line and used a new furrel on the copper line). Note that the supply line now comes into the outlet valve from the top, not the rear as on the old valve, so now the dual outlet valve sticks out beyond the frame of the refrigerator. I tightened the nuts on the plastic supply lines on the valve. I had to cut the cardboard cover around the new outlet valve. Resecured the cardboard cover to the back of the frig. Checked for leaks, turned the icemaker on by lowering the shutoff arm, and after a few moments, the outlet valve opened, water flowed into the icemaker, and all is well.