Yes sir, I did the migration. I did the forget all devices using my android phone. I don't have a desktop. Was android okay?
The fact that the hash key is being returned as what looks like a device id implies to me that the devices hasn't been successfully forgotten and then rediscovered. You don't necessarily need a desktop, you can log onto Alexa vis the Alexa website at alexa.amazon.com.
If you select and Edit...
your Indigo Alexa-Hue Bridge, and then do an Edit Device Settings...
- you can then click on the pull-down in the Allocated Alexa Names
section and select a device. This will show you the Alexa-Hue Bridge it belongs to, the related Indigo device and the hash key which should be a long hex character string. If it isn't, then it won't work. The Alexa device needs to be successfully forgotten and re-discovered in order for the new style hash key to be allocated.
Hope this helps.