The value "(data not available)" appears in your reports when data in Google Analytics is unavailable or hasn't been processed for the source and medium traffic-source dimensions. More (data not available) values are expected in Intraday than Daily intervals because Intraday data allows for less attribution data processing time. Event level data, but not user or session level data, can be updated up to 12 days later as modeling improves the data quality.
This document describes common reasons for this.
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Why you're seeing "(data not available)"
The following provides information about the most common reasons why you may be seeing the "(data not available)" value in your Google Analytics reports:
- Processing time: The "(data not available)" value can appear while traffic-source dimension values are being determined. When this is the cause, event (but not session or user) level data will be updated later. Learn more about Data freshness.
- Over represented User ID: You may have data errors because your setup allocates the same User ID to too many events. This typically occurs when your property incorrectly assigns a canned User ID to your users. Analytics will treat these many users as a single user attributed to the Direct channel. You may also experience other adverse effects throughout Analytics such as under-reported user counts.
- Processing failures: In rare cases, system failures may result in an inability to retrieve dimensions for an advertising ID; (data not available) will result.