How come I'm getting so much unspecified for mobile screen size in AA using the ootb dimension? I’ve brought in mobile device then broke it down by mobile screen size.
What does unspecified mean?
In a breakdown, if the second variable was not seen on the hit or the first variable persisted from a previous hit, the breakdown row becomes Unspecified.
So, if a hit is still attributed to the device, but screen size was not available for that hit, you get Unspecified under that device.
https://experienceleague.adobe.com/en/docs/analytics/technotes/unspecified
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