Additionally, you can learn about domain mapping and the setup process in another useful tutorial, How to do domain mapping in WordPress multisite network..

when I hit publish I get message at the top of the screen that says.

If we are talking about internet addresses encoded in QR codes (URL), Static QR codes are containing final destination where you will be redirected after scanning. Dynamic QR codes contain intermediate location that willl then redirect user to desired des

Domain mapping allows you to map domain names to different sites in your WordPress multisite network.