Worked with Echo, removed... and now cannot add back

[tomgreever]

My D1 mini was working with my Echo / Alexa devices just fine. I was having an issue with it, so I decided to remove it from the Alexa app using the trash icon. It is now no longer in the Alexa app. Now I cannot add it as a device again. Alexa attempts to find devices. The D1 mini receives the request and sends a response, but Alexa never adds the device.

Here's the output of the monitor:

Begin multicast ..
Udp multicast server started at 239.255.255.250:1900
WebServer started on port: 
80
Adding switches upnp broadcast responder
Adding switch : cabinet  index : 0
Got UDP Belkin Request..

Sending response to 10.0.1.2
Port : 50000
Response sent !
Got UDP Belkin Request..

Sending response to 10.0.1.2
Port : 50000
Response sent !
Got UDP Belkin Request..

Sending response to 10.0.1.2
Port : 50000
Response sent !
Got UDP Belkin Request..

Sending response to 10.0.1.2
Port : 50000
Response sent !

Eventually, Alexa app says it could not find any devices. Any ideas how I can fix this?