only one receiver (the one connected via the motor) can move a dish

the second receiver connected direct to the twin output lnb is a slave only, it can only "see" the satellite that the MASTER receiver has told the dish to go to

so MASTER receiver moves the dish , the SLAVE receiver doesnt move the dish

connect an A-B switch if you want both receivers to move the motor and dish, albeit only one can do this task at any one time