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Pin 0.17 not working as TX UART - BLE_APP_UART NRF52840

Hey, I am having trouble setting Pin 0.17 as UART TX. I have tested my code on pins 6,8,15 and 18 as UART TX and the code works. I get the required output on serial. I am currently testing on NRF52840 DK.

Previously I was using a custom board with an LTE module connected on pin 0.17 and it was not working. So I came back to my DK and tested if the AT commands are being sent correctly and figured out that Pin 0.17 does not work as UART TX and that was the problem with the custom board as well.

There is no other thing configured to PIN 0.17 I cross checked that.

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