re reading your original post I get confused. The air should not have a blue light at all.
A blue led on the hub is bluetooth, not the air, so my first reply isn’t correct. Sorry (happens when you read quickly)
here is a page with complete troubleshooting details
If what you call blue is purple …
Solid purple : The device is not connected to a Hub.
If your device is not paired to the Hub, open the app, go to settings > stations >(select your station) > manage devices > tap “+” to add a device.
To successfully pair the device you might need to power cycle the unit. Open and close the battery door so the device rebroadcasts its pairing signal to the Hub.
if this still doesn’t work, best is to contact support. In worst case you get another unit,
Here are their contact details
support via the website : http://got.wf/contact
support via mail : firstname.lastname@example.org
sorry again for the confusion