More tips for using user IDs:
- Ensure user IDs are unique: User IDs must be unique among the population included in your rollout. Optimizely buckets users based on the user IDs that you provide.
- Use IDs from third-party platforms: If you are measuring the impact of your feature in a third-party analytics platform, we recommend leveraging the same user ID from that platform. This helps ensure data consistency and make it easier to reconcile events between systems.
- Use either logged-out or logged-in IDs: Optimizely doesn't currently provide a mechanism to alias logged-out IDs with logged-in IDs. If you are rolling out features that span both logged-out and logged-in states, you must persist logged-out IDs for the lifetime of the feature.