Devices (iPhone, macOS) fail to connect to Guest 2.4GHz network…

Devices (iPhone, macOS) fail to connect to Guest 2.4GHz network but do successfully connect to 5GHz; problem occurs even after power cycling SENSE router. Any ideas as to cause or how to investigate further?

FYI no problem connecting to non-Guest network on 2,4GHz or 5Ghz

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