@David-TP yes correct I connect in access point mode. my switch is tplink LS1210GP 10 port. I can have tried different configurations and can get always only get one to work wired but the other...

I have a fritzbox router connected to a tplink poe switch in my utility. from there I have 2 ethernet cables going to opposite ends of my home with x50 poe devices at each end. one of the x50 works...