If you change the digital key after uploading to Ezi-Debit it won’t download the payments. You need to have the original digital key. But before the digital key number will take effect you need to shut down KM and reopen KM5. The program remembers what digital keys it starts up with even if changed.
Put back the old digital key and restart KM5. Download the payments.
Now change to the new digital key and restart KM5 before continuing with the next Ezi-Debit upload