I see it on the Watch window and on the peripheral window

Disable all sleep activation

FIRST run the uC for 5 seconds, then stop (CTL/BRK or whatever your ICE uses).

verify the stop is in the main not somewhere else.

check port config in the ICE at the stop.

If EA, EKBI, KBCON.0 all are set, the ISR should activate.

DO NOT assume anything, verify every bit read in the ICE by the UG or datasheet

If that does not help, post all the above as you read it in the ICE.

Judge by the ICE display of P0 that the keys 'get in'

Erik