All the routers I've used need to have the Pi MAC whitelisted, otherwise they just ignore it.
That's never been a problem for me. The Pi shows up and is treated like any other device on my network. All your routers must have MAC address filtering turned on (normally that's off by default).
I don't use cheap 'domestic grade' routers that compromise security over 'user friendliness'; MAC address filtering is on (I've not looked to see whether you can actually turn it off), and you have to jump thru' hoops to add MACs.
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