Hi @Irv95G ,
Do you mean, you are using the external LPC-LINK2 in stead of the on board CMSIS DAP debugger?
If you are using the external debugger, you need to disconnect the on board debugger, J47-J50.
Then connect your external LPC-LINK2 to the j16 jtag port, in your MCUXpresso, please also press shift+debug button, to recognize the external debugger again. Or you can delete the .launch file, then click debug button again.
Wish it helps you!
Best Regards,
Kerry