Hi,
Apologies for the confusion. I was asking if you could send me (reply privately to author) the logs shown when you copied the URL in the browser to generate the refresh token. Also, could you please confirm if you are using another AdWords account when you generate the new project with app type as web app? I ask this because I need to confirm if you are using the same AdWords account for the project with installed app and the project with web app.
If you are using the same account, could you please try doing the steps for web app project using another AdWords account and let me know if this solves the issue? Also, if you are doing the web app, you should follow the
steps for the web app flow which includes entering the JavaScript origins, redirect URIs or both then define your CALLBACK_URL in the GetRefreshToken. Hope this helps.