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I'm not getting the accesstoken from Oauth after successful authentication.
Can anyone help? Here's the code. It's in Flutter
TL;DR
The user is having trouble getting the access token from OAuth after successful authentication. They are requesting help and providing their code in Flutter. The solution may involve checking the `createOAuth2Session` function and adding success and failure URLs for web-applications. Additional information and resources have been shared in the support thread. 
In summary the createOAuth2Session function doesn't return anything it just start the OAuth2 login redirect process with needed values.
Also, if it's a web-app you'll need to add success and failure URLs like in here: https://discord.com/channels/564160730845151244/1114222859166949499/1115653351208652914
