How to use a next-auth jwt in relay-nextjs?

I am trying to use next-auth with relay-nextjs. I setup next-auth per a hasura jwt example, and relay-nextjs per the official docs. I want to pass a next-auth jwt Bearer token in the relay-nextjs Authorization header sent to the GraphQL endpoint.

1. next-auth provides a getSession method. Under the hood, this requests a server endpoint.

2. relay-nextjs provides a serverSideProps property of a withRelay HoC. You pass your page component to withRelay. You add a function to serverSideProps that will send a token to the page's Relay environment.

My problem is getSession is null inside serverSideProps:

serverSideProps: async (ctx) => {
    const { getSession } = await import('next-auth/client');

    // This is an example of getting an auth token from the request context.
    // If you don't need to authenticate users this can be removed and return an
    // empty object instead.
    const token = await getSession();
    return { token };
  }

If I can get the token here, it works in relay-nextjs. Returning a string works fine, adds it to the header.

There's a next-auth cookie with the app page request. I checked it against the endpoint called by getSession. The cookies don't match. They do, until this part after the last dot, which changes on each request.

session-token=xxxx.xxxxxxxx.xxxxx

I ran it through the debugger, and it looks like relay-nextjs executes before the next-auth callback.

One approach I'm trying now is store the next-auth token in a database, and run a prisma query instead of getSession. Any input is welcomed.