I can't set personal ID network register

, I have Xbee s2 connected to Atmega MC. When I try to set up personal ID network nothings happen. I send +++ to get into AT mode. I received ok/n then I send out ATID followed by hex number. I received OK/n. After that I send AT ATAC to apply the change. I follow with ATID to see if any changed happened but I get 0/n all the time. Buad rate is set on 9600 for both devices. I measured 9661 on my MC and 9603 on Xbee. Any advice on how to fix this? The Xbee has the coordinator AT latest firmware

Which XBee module and firmware on the XBee are you working with?