We're currently working on a solution where a small number of Amazon Eero users are having trouble discovering A2D2 devices with the iOS App. 

We have 2 workarounds in place whilst we finalise a software update:

1 - Connect A2D2 with an Ethernet cable 

2 - Use the A2D2 web app (http://a2d2.local if you haven't renamed your device)

Feel free to reach out if you have questions about this.