Failed to get token: [error: invalid_client, description: null]

[andreacona96]

Hello,
I am trying to integrate OIDC login into my Flutter app, but the .token() method keeps responding with "Failed to get token: [error: invalid_client, description: null]".
When I call the .authorize() method, I can correctly see the authorizationCode, codeVerifier, and nonce.
However, when I pass these parameters to the .token() method, I receive the error.

Can you help me?

Thanks.