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Unfortunately, because data in Google Analytics is processed at the time of collection and is not retroactive, you cannot recover the old dimensions data that was incorrectly configured. The incorrect setup would mean the data was likely not stored in the way you intended. However, any dimensions sent in the URLs during page views might be recoverable by analysing the URL data, which would require a manual extraction and analysis of the URL data. Going forward, it’s recommended to correct the setup as you have indicated to ensure the data is sent and stored correctly. You should also regularly check and validate your data to ensure it’s being captured correctly.
