Digi XBEE 3 ZigBEE 3 Router Not Joing Cooridnator Network

I am trying to communicate between 2 modules of Digi Xbee 3 Zigbee 3 (SMT Micro Module)

I am facing the following problem:

  1. Module 1: Set as Coordinator

  2. Module 2: Set as Router

The Router is unable to join the Coordinator network. We have doubted and tried to work on the following:

  1. Antenna: Changed and Checked
  2. Antenna Proximity: Brought the two extremely close and yet not working ( Although 13db Output Power)
  3. Changing Channels
  4. Changing Transparent and API modes
  5. SC Channels: Gave Specific Scan Channels
  6. Tried DigiMesh Communication with Default Settings.

We have been unable to connect the two and its necessary fo rthe 2 to communicate on a particular channel.

Please guide and help.

Try setting the NJ time on the Coordinator to 0xFF. Then issue an ATNR0 to the router.