So I have setup my spring backend as the single and central source of AuthN and AuthZ and I'm trying to get AuthJS on my nextjs frontend to work with my spring backend. Here is my auth.js file

import NextAuth from "next-auth";
import Credentials from "next-auth/providers/credentials";
export const { handlers, signIn, signOut, auth } = NextAuth({
  providers: [
    Credentials({
      credentials: {
        email: {},
        password: {},
      },

      authorize: async (credentials) => {
        const res = await fetch("http://localhost:8091/api/auth/login", {
          headers: { "Content-Type": "application/json" },
          method: "POST",
          body: JSON.stringify(credentials),
        });
        const user = await res.json();

        if (user.ok) {
          return user.user;
        }
        return null;
      },
    }),
  ],

  callbacks: {
    async jwt(token, user) {
      if (user) {
        token.id = user.id;
        token.email = user.email;
        token.name = user.name;
      }

      return token;
    },

    async session(session, token) {
      session.user.id = token.id;
      session.user.email = token.email;
      session.user.name = token.name;

      return session;
    },
  },

  session: {
    strategy: "jwt",
  },

  secret: process.env.AUTH_SECRET,
});

And here is the response sent back by the login endpoint from the backend

{
    "sessionId": "4b3f3a06-7af2-4f01-bf71-e1ea0b095368",
    "ok": true,
    "user": {
        "name": "test@test.com",
        "email": "test@test.com"
    }
}