@Inept 

Network printers are kinda notorious for this, but thankfully, it's usually a quick fix.

If the printer is already on the new network but you can't send print jobs to it, this is most likely because the devices requesting the print jobs (e.g., PCs) are still looking for the printer at its previous network address (the one it had on your AX21).

In most cases, you can either manually update the printer's network settings on your PC to point to its new IP address, or simply us the printer software (e.g., setup wizard, network wizard) on the PC to locate the printer and associate the new IP address with its profile on your PC, so it can properly locate and send print jobs to it. Depending on your printer make/model, the steps may slightly vary, but most modern printers make it rather easy using software tools. If need be, you can usually reach out to the printer manufacturer for technical support as well.

Hope this helps!