withAuth Middleware not working on Vercel deployment

[thejessewinton]

I've got a really weird issue using withAuth; for some reason my local configuration works just fine, but when I deploy to Vercel it's not authorizing a user. This is what my middleware looks like:

import { withAuth } from 'next-auth/middleware';

const middleware = withAuth({
  pages: {
    signIn: '/sign-in',
  },
});

export default middleware;

It lets me run the sign in flow, but then keeps redirecting me to sign-in. Any idea what this could be? It's only doing this on Vercel.

[techied]

Probably related #4969

[thejessewinton]

Probably related #4969

I did see this one; the solution for them was downgrading Next to v12.2.2 and I was already running 12.2.2, so no dice.