Welcome to the Auth0 Community!
I have been searching around for more information that could help with the issue, and I have been able to find the following:
- In the following GitHub repo, the same error message has been reported and in one mention, this configuration was working correctly while using webAuthentication().login(), which could help clear the issue. This originated from the following Community Topic;
- The following documentation goes over some information with regards to Flutter SDK support for Web applications , although it could be outdated;
- Our blog on about Flutter Wishlist App, in case applicable for you, talks about user Authentication and could provide useful information;
- This section of the GitHub repo showcases the Linux files for the SDK.
Let me know if these documentations have help clearing the issue, or if you are still experiencing it.
Hope this helped!
Gerald