We ran into the [next-auth][error][NO_SECRET] issue, and here's how we resolved it:

1. Expose the NEXTAUTH_SECRET Environment Variable:
   We ensured that the NEXTAUTH_SECRET environment variable was available during both the build and runtime processes. To do this, we added the NEXTAUTH_SECRET to the env field inside next.config.js.

module.exports = {
  env: {
    NEXTAUTH_SECRET: process.env.NEXTAUTH_SECRET,
  },
};

This made sure that the secret was correctly injected into the app when it was built and when it ran on AWS Amplify.

2. Set the NEXTAUTH_SECRET in AWS Amplify:
   In AWS Amplify, we navigated to the Backend environments section and correctly set the NEXTAUTH_SECRET under environment variables. This ensures that the secret is available in the AWS environment as well.

3. Redeployed the App:
   After making these changes, we redeployed the app in Amplify. The redeployment applied the environment variable settings, and the [next-auth][error][NO_SECRET] issue was successfully resolved.