Spent hours with level 2 engineer who had escalated to level 3 engineers. They went through my router settings and changed everything but still could only connect 1 speaker to the system and then any other speaker would error out on setup and say no sonos devices found on mobile device network. The next morning I figured what the heck I will stop using the Nord Secure DNS servers. After making this change was able to setup all devices as normal.
Secure DNS not allowing Setup of Devices
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Using a filtered DNS may well result in some essential Sonos network names not resolving to IP addresses. I find that true for my Sonos and multiple other devices.
Pain in the neck but I've learned to switch to an unfiltered dns server for any hardware setup. Depending on your router you might be able to assign different dns servers to different clients.
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