Music Library (Minimserver) No Longer Visible

[Afveep]

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Check router and firewall settings. Something there is preventing wifi devices from seeing the network. Also, from your Mac's perspective, changing to wifi could be regarded as switching to a different network that is treated differently. For example, in Windows you have a distinction between home vs public networks.
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Unfortunately the Eero router has no advanced settings that I can find. I've sent a support request into them to ask about multicast.