Sign in With Apple shows this error "Sign-Up Not Completed" when we tap on continue button and after verifying Face ID.
The Sign in with Apple servers require percent encoding (or URL encoding) for its query parameters. If you are using the Sign in with Apple REST API, you must provide values with encoded spaces (`%20`) instead of plus (`+`) signs. For example, if your request URL currently looks like this—
.../auth/authorize?client_id=<CLIENT_ID>&redirect_uri=<REDIRECT_URI>&response_type=code+id_token&scope=name+email&response_mode=form_post&state=<STATE>&nonce=<NONCE>
Please attempt again after updating the request URL to the following—
.../authorize?client_id=<CLIENT_ID>&redirect_uri=<REDIRECT_URI>&response_type=code%20id_token&scope=name%20email&response_mode=form_post&state=<STATE>&nonce=<NONCE>