@ Stumacdon
Once again, do not just TRY to use the included power supply, use it exclusively! Dot instructions say use the exact equipment that comes in the package. Also, install the app from the official store, and not some "underground" alternative.
I have several Echo devices set up already (Echo, Dots and Taps) and yesterday I set up my first new 2ndGen Dot. Setup went fine, all worked well, but when I was changing the location within the Settings (by putting in my address and zip code), and tried to save it, the Dot disconnected from wi-fi and it took me several tries to reconnect the wi-fi through the setup again. I tried several times and kept getting an error message. I was considering resetting the darn Dot, but tried one last time and the following steps apparently did the job:
Before I unplugged the Dot power and let the Dot rest for over three minutes (as suggested by online Echo Dot help) ,I was able at one point, (trying to connect wi-fi again), to tell the setup to "forget" my network signal I was attempting to connect to (I knew it would reappear when I tried connecting next time).
I closed Alexa app on iPad and rebooted my iPad tablet in case there was something "erroneous" held in the iPad's (or app's) cache.
Then, I powered up both devices again, and went through the steps again and it all finally went well and the Dot connected to my wi-fi; no problems, and the Dot worked completely fine again.
When I tried entering the location data this time, I thought to tap the Enter key after each entry was made, and when I saved it I had no problem as before. All is well; I even connected the Dot and my bluetooth speaker together successfully.
I hope these tips help you get connected.