When Google Analytics GA4 UTM parameters are not recognized correctly, traffic cannot be attributed to campaigns. GA4 supports the same UTM parameters as Universal Analytics. However, common URL formatting errors lead to incorrect recognition. In this post about UTM parameters in GA4, we show the most common problems and solutions. We explain how to use UTM parameters correctly.

Why Are GA4 UTM Parameters Not Recognized Correctly?

The most common error is incorrect URL syntax. UTM parameters must start with a question mark and be separated by ampersands. This means a double question mark or missing separators make the parameters unreadable. Additionally, UTM parameters are case-sensitive: ‘utm_source=Google’ and ‘utm_source=google’ create two different source entries. Also check whether your URLs redirect correctly, as redirects can strip parameters. Read our post about what to do when GA4 only shows (not set) as traffic source.

Typical UTM Errors and Their Effects in GA4

Beyond syntax errors, there are other UTM parameter issues. Website redirects (301 or 302) can strip UTM parameters from the URL. Furthermore, some content management systems filter query parameters from URLs. Using the Google Campaign URL Builder helps prevent errors. Consequently, you should test every campaign URL before deployment.

Our Recommendation

Use the Google Campaign URL Builder for all UTM links and define a consistent naming convention in lowercase. Test every UTM link before deployment by opening it in the browser and checking the GA4 real-time report. Additionally, we recommend a central UTM tracking spreadsheet documenting all campaign URLs. Consistency in naming is more important than parameter detail depth.

Conclusion

UTM parameter issues in GA4 can be prevented through consistent naming and correct syntax. Test every link in the real-time report before deployment. Our Google Ads agency creates professional campaign tracking setups. Also read our post about discrepancies between GA4 and Google Ads numbers.