Please attach the logs (Help => MCUXpresso IDE Save Info for Support)...
Regards,
MCUXpresso IDE Support
s the J-Link listed in your device manager?
Check that you are connecting with SWD and not JTAG (launch config). The debugger console view should give you some more details.
Other than that: https://mcuoneclipse.com/2018/01/28/troubleshooting-tips-failed-debugging-with-gdb/