Receiving "Error: data and salt arguments required" when trying to post to NestJs backend from react frontend. Works in Postman

Question

I have been stuck on this problem for a few days now. I have a NestJs backend that runs on localhost:8080 with user authentication. When I use postman to login or register a user, it works perfectly fine. But when I try to do so from my React frontend, I get the following: ERROR [ExceptionsHandler] data and salt arguments required.

Here is the code for my auth controller:

@ApiTags('auth')
@Controller('auth')
export class AuthController {
     constructor(private readonly authService: AuthService) {}

     @Post('register')
     async register(@Body() registrationData: RegisterDto) {
          return this.authService.register(registrationData);
     }

     @HttpCode(200)
     @UseGuards(LocalAuthenticationGuard)
     @Post('log-in')
     async logIn(@Req() request: RequestWithUser, @Res() response: Response) {
          const { user } = request;
          const cookie = this.authService.getCookieWithJwtToken(user.id);
          response.setHeader('Set-Cookie', cookie);
          user.password = undefined;
          return response.send(user);
     }

     @UseGuards(JwtAuthenticationGuard)
     @Post('log-out')
     async logOut(@Res() response: Response) {
          response.setHeader(
               'Set-Cookie',
               this.authService.getCookieForLogOut(),
          );
          return response.sendStatus(200);
     }

     @UseGuards(JwtAuthenticationGuard)
     @Get()
     authenticate(@Req() request: RequestWithUser) {
          const user = request.user;
          user.password = undefined;
          return user;
     }
}

On the frontend, I have a simple login component:

import { useRef, useState, useEffect, useContext } from 'react';
import AuthContext from '../../context/AuthProvider';

import axios from '../../api/axios';

const LOGIN_URL = '/auth/register';

const Login = () => {
    const { setAuth } = useContext(AuthContext);
    const userRef = useRef();
    const errRef = useRef();

    const [user, setUser] = useState('');
    const [pwd, setPwd] = useState('');
    const [errMsg, setErrMsg] = useState('');
    const [success, setSuccess] = useState(false);

    useEffect(() => {
        userRef.current.focus();
    }, []);

    useEffect(() => {
        setErrMsg('');
    }, [user, pwd]);

    const handleSubmit = async (e) => {
        e.preventDefault();

        try {
            const response = await axios.post(
                LOGIN_URL,
                JSON.stringify({ user, pwd }),
                {
                    headers: { 'Content-Type': 'application/json' },
                    withCredentials: true,
                }
            );
            console.log(JSON.stringify(response?.data));
            //console.log(JSON.stringify(response));
            const accessToken = response?.data?.accessToken;
            const roles = response?.data?.roles;
            setAuth({ user, pwd, roles, accessToken });
            setUser('');
            setPwd('');
            setSuccess(true);
        } catch (err) {
            if (!err?.response) {
                setErrMsg('No Server Response');
            } else if (err.response?.status === 400) {
                setErrMsg('Missing Username or Password');
            } else if (err.response?.status === 401) {
                setErrMsg('Unauthorized');
            } else {
                setErrMsg('Login Failed');
            }
            errRef.current.focus();
        }
    };

    return (
        <>
            {success ? (
                <section>
                    <h1>You are logged in!</h1>
                    <br />
                    <p>
                        <a href="#">Go to Home</a>
                    </p>
                </section>
            ) : (
                <section>
                    <p
                        ref={errRef}
                        className={errMsg ? 'errmsg' : 'offscreen'}
                        aria-live="assertive"
                    >
                        {errMsg}
                    </p>
                    <h1>Sign In</h1>
                    <form onSubmit={handleSubmit}>
                        <label htmlFor="username">Username:</label>
                        <input
                            type="text"
                            id="username"
                            ref={userRef}
                            autoComplete="off"
                            onChange={(e) => setUser(e.target.value)}
                            value={user}
                            required
                        />

                        <label htmlFor="password">Password:</label>
                        <input
                            type="password"
                            id="password"
                            onChange={(e) => setPwd(e.target.value)}
                            value={pwd}
                            required
                        />
                        <button>Sign In</button>
                    </form>
                    <p>
                        Need an Account?
                        <br />
                        <span className="line">
                            {/*put router link here*/}
                            <a href="#">Sign Up</a>
                        </span>
                    </p>
                </section>
            )}
        </>
    );
};

export default Login;

I'm completely stumped as to how to fix this error. I'm not sure why bcrypt is saying the password is undefined/it can't hash it.