2.4Ghz Logitech hub... not 'discovered' on my macs... but is discovered on iPhone.

[NightHawkRAX80]

The harmony hub comes with a variety of desktop and mobile clients that allow you to control devices in your home.
I believe their solution uses a broadcast message to announce itself on the local area network... like a SSDP...
I have heard that due to not being able to broadcast UDP 'everywhere' this protocol breaks down.

Is there a netmask that might be wrong... if the device is on 2.4Ghz and other client is on 5Gh ?

The router connected devices shows the device and I get it's IP.
I try to manually add it there and even that doesn't work.   Rebooted both router and harmony hub.. but same results.

Hardware:

RAX80

Firmware:

V1.0.5.126_1.0.65

Mac OS 10.15.7 (and big sur)

iOS 14.7.1

[NightHawkRAX80]

Multiple reboots (router and hub) ... many password resets and finally.. it works.