Alexa appinventor: no connection to Amazon

[H_So]

I am working with alexa appinventor (https://alexa.appinventor.mit.edu).

After creating a new project and adding a skill (Button Add Skill…), I wanted to log in to Amazon (Button Login to Amazon), but I got a blank window:

The url of the opened window:

url:https://appinventor-alexa.csail.mit.edu/appinventor-iot/appinventor/amazon-standalone/login-amazon.html?error_description=Implicit+Grant+(response_type%3Dtoken)+is+no+longer+supported.+See+deprecation+notice+at+https%3A%2F%2Fdeveloper.amazon.com%2Fdocs%2Flogin-with-amazon%2Fimplicit-grant.html%23deprecation-notice&error=unsupported_response_type

gives an error-description when you look at the details of the url.

I have an Amazon Developer Account and used alexa.appinventor already in year 2020.At this time it worked fine!

I hope someone of the appinventor developers can help to solve the problem,

thanks in advance!