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I begrudge having to even request this given it's such a fundamental flaw in the SPC app. Am running RBK853 with SPC and it flat refuses to manage devices that are connected to the Guest network....
That's be cause,
1. GN connections are tied to the WAN side of the router and separated from the LAN side thus not interconnect between them.
2. GN connected device on a standard basis have a limited time span so guest are usually only connected to the GN for a short period of time. Nothing long term so would be no reason to manage GN devices with the SPC app.
3. Something I presume NG limits for cost of development to LAN side only devices.