For 1 thing, the ISP know nothing about your internal LAN. 2nd, 99% of people use the default routers wifi ssid’s which are different than your last wifi name(s). 3rd, you never use a printers ip, you use wifi to find it.
I’ve used the same ssid (yes only 1) for decades for both the 2.4 & 5ghz bands, so I don’t need to change anything.
If you have 2 ssid’s, go into the router and setup 1 ssid for both bands to your old ssid name, reboot your printer and you should be fine.
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