I've owned my Harman/Kardon Invoke speaker for almost 3 years now, and haven't had an issue with it until now.
It stopped working suddenly, and when I tried to reset it (by holding the mute button for 5 seconds) the speaker never finishes setting up. The Cortana device setup app says it's ready to go, but the speaker itself never says so, the light just keeps slowly blinking forever.
I've tried using different WIFI networks, re-installing the setup app, trying the setup on my phone, and I've even made sure all my software is up to date. I have a theory that the device can never be linked to my account for some reason, since it never shows up in the "My Devices" panel in my Cortana app.
If anyone has a solution to this, it would be much appreciated!