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CC2640R2F: Programming custom CC2640R2 board with Olimex XDS100v3 debugger.

Part Number: CC2640R2F

Hello there,
I'm trying to program a custom board of CC2640R2 MCU made by me based on a TI reference design. I'm using Tag-Connect's TC2050IDC-NL  connected to Olimex XDS100v3 debugger via 20 pin ARM-JTAG connector and Tag-Connect's 20 pin to 10 pin connector. 
Jumper J4 and J5 are open and ARM_JTAG_E is closed as mentioned in the user guide of debugger.
I've also changed the connection settings in CCSv7.1 to XDS100v3 Debug probe. 
Upon testing the connection, I'm getting the following error message:

"The controller has detected a target power loss. The user must turn on or connect the power supply for the target." I've attached a screenshot of CCS as well showing this message.

Upon checking that whether we're getting the power supply from 20 pin ARM-JTAG connector using a multimeter, we got to know that we're not getting any voltage difference between Pin no. 1 (T_TVD) and Pin no 4/6/8...20 (GND). Should we need to do some other configuration or settings for programming our custom board? 
Help required?