Hi Rick,
NZNP has a runway length of 4200. The CRJ has a minimum runway length of 4500, so NZNP shows as not in database. Please see Page 8 of Aerosoft CRJ Vol1_Aircraft Operating Manual_Part-1.pdf:
Please note that the navigation systems will NOT show any airport that does not have a runway long enough (4500 feet) for the CRJ to use.
Although unrealistic and unsupported, I guess you could edit
…your MSFS\LocalCache\Packages\Community\aerosoft-crj\Data\NavData\Airports.txt and change entry for NZNP from 4200 to 4500. This will be overwritten with each AIRAC update.
See also MSFS 2020 Aerosoft CRJ navigraph FMS Data missing airports.
Cheers
Ian