Can't Connect HP Printer Wirelessly to 5G Home Internet Gateway

You're welcome.  This comes often.   I have my explanation saved in a Word doc.

If you can get the printer to connect to the second network, I recommend changing your primary network back to Automatic and WPA2/WPA3.  That is a lot more secure, which is better for your computers and phones.  It works for almost all of my devices.  One notable exception is my ancient desktop computer which needed the less secure network.  I made that network Hidden, which is the best I can do for its security.