Storage Teleporter

I’m trying to set up the Storage Teleporter and I can’t seem to get them working. I have the teleporter station (powered), both teleporters have the same name, and the conveyor belts are in the correct positions. In the drop-down at the bottom of the details window, I selected the partner and saved but it hasn’t helped. When I reopen the details, it’s not paired anymore. What am I missing pls?
@Blockout22