Can't get the Solar 4K to power up.

Hi all. I just got a couple of Apex 300’s and a B300K for each as well as the A1 box and the Solar 4K. I can’t seem to get the Solar 4K to light up. I have tried it with my AC300 and nothing happens and with both the Apex 300’s. I checked and double checked the wiring and it all seems like the specs in the manual, although my AC 300 connects the solar neg to pos on the AC 300, the manual for the SolarX 4K says solar neg to SolarX 4K neg and pos to pos. That seems odd to me, but I’ve never had an external solar controller before. I also found the SolarX 4K on the app, but when I go to click on it, nothing happens. Does anyone have any ideas for me to try?

Thanks Clay