Welcome to the Hubitat community!
Typically this means you don't have an internet connection for some reason.
- Is the device working and can you access the device, or is is not showing up on your network?
If you can access the hub, there was a bug in a recent firmware where this light would flash when it shouldn't have. I believe the latest firmware corrects that, so if you can access the hub, I would do an update through the Settings tab.
For the following, I am assuming you can't access the hub.
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Have you tried doing the network reset procedure by pressing the button on the bottom of the hub? There is a picture of how to do that part way down on this page I am linking. Network Setup | Hubitat Documentation
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Have you tried a different ethernet cable or rebooted your internet router?
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Have you tried a hardwired computer on your same network, or are you using your phone to set up the hub?
I will be at work all day, but hopefully someone else can assist when you reply to my questions above.
