Getting redirect_uri_mismatch with Sign on With Google

I'm getting redirect_uri_mismatch when the backend is attempting to exchange an authorization code for an ID token with Google.

400 Bad RequestPOST https://oauth2.googleapis.com/token{"error": "redirect_uri_mismatch","error_description": "Bad Request"}

NOTE: The JavaScript front end gets the authorization code just fine.

I've spent multiple days searching the web, Google's documentation, searching StackOverflow, chatting with ChatGPT. I'm stumped.

React front end using "@react-oauth/google": "^0.12.1"

const login = useGoogleLogin({    flow: 'auth-code',    onSuccess: async (response) => {        try {            var data = { code: response.code };            const session = await post('api/v1/sessions', data);        } catch (error) {            console.log(error);        }    },    onError: error => console.log(error),    redirect_uri: 'http://localhost:5173/login'});return (<div className="p-4"><div className="space-y-6 text-left"><Button label="Sign with Google" onClick={() => login()} type="button" /></div></div>);

Backend is Spring Boot 3.2.2 with Java 21, google-api-client-servlet 2.4.0

public GoogleIdToken getIdToken(ClientSecrets secrets, String authorizationCode) {    try {        var response = new GoogleAuthorizationCodeTokenRequest(            new NetHttpTransport(),            GsonFactory.getDefaultInstance(),            secrets.getDetails().getTokenUri(),            secrets.getDetails().getClientId(),            secrets.getDetails().getClientSecret(),            authorizationCode,"http://localhost:5173/login") // redirectUri        .execute();        return response.parseIdToken();    } catch (Exception e) {        throw e;    }}

redirectUri: http://localhost:5173/login
Google Console: