Learn business growth with Google Analytics 4 › Forums › Google Analytics 4 › How to create a user ID for GA4 to BigQuery › Reply To: How to create a user ID for GA4 to BigQuery Addison Member 3 May 2023 at 5:25 pm Yo, in step 5 there’s a slight mix-up. Instead of userId, you should be using user_id. It’s a little quirk of GA4. Check out this doc for a rundown on how GA4 works with user IDs. Happy coding!