Message on TV when attempting to connnect wireless receiver: set top box does not mat

#1
For DirecTV TV services which include DVRs and receivers, Message on TV when attempting to connnect wireless receiver: set top box does not match account. I've tried repeatedly to set up a new wireless receiver that the technician left for us when our service was recently moved. Continue to get the same message in spite of rebooting everything. Other posts lead me to believe this will require some help from AT&T. Help!!
 
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