Not able to perform dfu over ble using nrf7002

I am using a module MS12SF1(nrf5340 + nrf7002). I wanted to perform dfu over ble by using nrf7002dk_nrf5340_cpuapp_ns or nrf7002dk_nrf5340_cpuapp build configurations but as soon as I enable the dfu configurations and flash the code I don't get anything in the logs and bluetooth also stops advertising 
I was trying this on peripheral_uart sample code 

I followed the course as well but nothing helped
What can be the issue?

Using sdk v2.6.1

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