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Adding custom dimensions to the “enhanced measurement” events in Google Analytics 4 (GA4) via Google Tag Manager (GTM) can certainly be a challenging task, especially if you’re trying to do it after the tracker has been configured. In GA4, the configuration call is important as it’s the stage where dimensions can be set for the tracking ID. However, if dimensions are not set during this stage, GA4 does not recognize them in subsequent calls, unlike the previous version.
Likewise, “set” operations may not work as GA4 integration might not pick up on set dimensions. This is a limitation observed, that doesn’t allow modifications after the tracker set up. The only reliable method currently to add or modify dimensions is to include them directly in the event call itself. This is because GA4 processes dimensions as a part of the event data, and adding them later can cause tracking issues. So while it may not be as convenient, ensuring that all required dimensions are included in the event call is your best bet to accurately configure and use enhanced measurement events in GA4.
