When you run the client, a window should pop up with a message that says -
Please register your device by visiting the following URL in a web browser and following the instructions: https://localhost:3000/provision/d340f629bd685deeff28a917(every time have different). Would you like to open the URL automatically in your default browser?
Click on "Yes" to open the URL in your default browser.
If you're running Raspbian with Pixel desktop (and with Chromium browser), you may get a warning from the browser. You can get around it by clicking on Advanced -> Proceed to localhost(unsafe). they done In normal cases they show the amazon page,which we enter the amazon credentials.
BUT in my case they go to this link https://www.amazon.com/ap/oa?client_id=amzn1.application-oa2-client.77a0007ccb274caa938c6d3403a52bb4&response_type=code&redirect_uri=https://localhost:3000/authresponse≻ope=alexa%3Aall&state=acc914f4-15b9-473a-8c62-6bb95ce17a38≻ope_data=%7B%22alexa%3Aall%22%3A%7B%22productID%22%3A%22test_device%22%2C%22productInstanceAttributes%22%3A%7B%22deviceSerialNumber%22%3A%22123456789%22%7D%7D%7D please help me to ensure they go to the amazon credentials page. thanks for your help in advance