Hi @Urban Lundberg
Glad to hear this issue has been resolved and thanks for the sharing!
However, due to a recent update in forum policy, the question author now is not able to accept their own answers.
So, I have written a brief summary of the solution this issue. Please feel free to ACCEPT it as the Answer, which would benefit others who also have similar issues in the forum.
Issue:
Cannot setup Outlook new on my computer, when Outlook new is trying to open the Gmail account, get the following error messages:
Access blocked: Authorization Error
Missing required parameter: redirect_uri
Error 400: invalid_request
Solution:
Changing the default browser from DuckDuckGo to Google Chrome.