Hello,
Could you help us confirm your version of MCUXpresso IDE, MCUXpresso Config Tools and SDK?
Probably you had an older version that does not contain MCXN947 and you need to update.
Kindly follow the instructions in this post to enable the Config tools updates.
Preferences>Install/Update>Available Software Sites>Enable MCUXpresso Config Tools
Updating Config Tools in the MCUXpresso IDE,
After this, probably some windows appear for available updates, select them and next, then accept terms of license agreement,
Click on Accept>Finish>Select All>Trust Selected>Restart MCUXpresso IDE
Let me know if that work for you, and if not, could you help us install the latest version of Config Tools (26.03) manually MCUXpresso Config Tools v26.03 and let me know your findings.
Best Regards, Luis