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Issue: PKCE authentication fails in browser due to base64 code challenge mismatch

Issue: PKCE authentication fails in browser due to base64 code challenge mismatch: a task in LegoFlow-SWE (Harbor dataset). The issue occurs when: - Using the DropboxAuth class with a given CLIENT ID . - Calling getAuthenticationUrl() with response type='code' to initiate a PKCE flow. -…

The task

The issue occurs when: - Using the `DropboxAuth` class with a given `CLIENT_ID`. - Calling `getAuthenticationUrl()` with `response_type='code'` to initiate a PKCE flow. - Redirecting the browser to the authorization URL, then returning to the app.

Part of Lego-X/LegoFlow-SWE.