On my Windows 10, I installed Microsoft Azure Bot Framework Emulator from the here (I had used botframework-emulator-setup-4.0.15-alpha.exe
from the GitHub link tha
You need to correct few things:
Change your messaging endpoint url to: http://localhost:PORT_NUMBER/api/messages
; where PORT_NUMBER is the port number your app will be listening to. It should be specified in your code and ideally for most bot developers, it's value is either 3978 or 3979
Check whether the MSA app id and MSA app password fields have any value in your code or not. If they have an ID-Password value present in your code then your emulator should also be configured with the same.
Install ngrok tunneling. https://github.com/microsoft/botframework-emulator/wiki/Tunneling-(ngrok)
Restart the emulator once installed.