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In Google Analytics 4, metric names in namespaced forms must comply with the following rules: they cannot have spaces in them and only special characters allowed are underscore (_) and period (.). The error seems likely because the GA4 API is not able to parse the conversion name when it contains space. Unfortunately, the API does not support conversion names with spaces, so you can’t replace space with any other special characters in a conversion name. The best way to handle this situation would be to rename the conversions in the GA4 interface to not include spaces. You can suggest to your customer to rename their conversions without spaces, it would be something like “conversion_with_space” instead of “conversion with space”. Following these naming rules should solve the issue you are facing.
