## Problem and Background
All pixels, when fired, have a cookie2 value which is in a recognized format. The value should start as “uid=..”. If not, then it is flagged as an error.
Cookie2 is used for tracking analytics across products and is needed for any personalization feature.
## Debugging Steps
Request the [Bloomreach Support](🔗) team to provide the list of URLs where the cookie2 value does not start as “uid=..”.
## Common Causes
This occurs when there are issues in the Br-trk.
Check the Br-trk logic and resolve the issue if you can identify the issue. If not, contact [Bloomreach Support](🔗) for assistance.
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