App will not discover Shelly 1PM

After a power outage, one of my Shelly 1PM would no longer connect to Wifi. Performed factory reset, and tried new setup. I configured via web app and was able to join it to my Wifi. But now the app will not see it as new device. Things I have tried:

1. Hardware reset via web app, 5 switch after power cycle, and hold reset button on Shelly

2. Update firmware

3. Ensured both Shelly and Iphone are on 2.4G wifi

4. Installed replacement Shelly that connects to the app without issue

I can connect to the Shelly 1PM using IP address, but the app will still not see it. I have also attempted to add new device to the app using the Shelly IP address, but throws an error and says "existing_device"

Any ideas?

That was it... I beat my head against this for several hours yesterday. Wow, thanks for the response!