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It appears that the issue lies in the interactions between the measurement protocol and GA4, particularly when it comes to creating custom events based on parameters given in the measurement protocol. It might be that these custom parameters aren’t being recognized as they should be. Custom parameters often need to be specified in the GA4 settings in order to ensure they’re being read properly. Make sure your ‘user_plan’ parameter has been registered in GA4 admin settings, in the custom definitions section. It’s also worth noting that custom parameters and events can take up to 24 hours to start appearing in your reports. So, even if everything is set up correctly, you may just need to wait. Also, it’s useful to validate events and parameters with DebugView or a third-party tool. If the issue persists, reaching out to GA technical support may be necessary so they can dig into the issue further.
