API Key plugin is always returning a KEY_NOT_FOUND error

app.use("*", async (c, next) => {
  const { error, key } = await auth.api.verifyApiKey({
    body: {
      key: "<key>",
    },
  });
  if (error || !key) {
    return c.json(
      { error: error?.message || error?.code || "UNKNOWN_API_KEY_ERROR" },
      401
    );
  }

  c.set("userId", key.userId);
  return next();
});