Using strava_client 2.1.3 for authorization to obtain token, the code is as follows:

ExampleAuthentication(stravaClient).testAuthentication(
  [
    AuthenticationScope.read_all
  ],
  "stravaflutter://myfitnessapp.com",
).then((token) {
  setState(() {
    isLoggedIn = true;
    this.token = token;
  });
  _textEditingController.text = token.accessToken;
}).catchError(showErrorMessage);

Strava backend configuration:

• Website: stravaflutter://myfitnessapp.com
• Authorization callback domain: myfitnessapp.com

Our app can open the Strava app's authorization page, but clicking "Authorize" shows an error. Our own app doesn't display any error messages.

Backend configuration:

• Allowed connected athletes: 999
• Current number of connected athletes: 1

•