There is currently a delay in the mobile ads report metrics. Our teams are aware of the issue and working towards a solution.
I do not use mobile ads or any kind of advertising in my app but I've had the delayed sales reporting message on my reporting page almost continuously since the end of June. Today is July 22 (2016). When is this going to end? I'm seeing nothing but flat-lining. Again, I don't have Mobile ads.
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