Error fetching analytics data after adding StatisticsCollector

I added a StatisticsCollector policy to one of my proxies a day ago and made some sample requests to ensure it didn't error. Today, I see the new statistic, teststatistic, available when creating a custom report. However, I tried running the report and I get "Error fetching analytics data:Invalid query parameter - Field teststatistic is not present in <my-orgs> schema. "

The docs say it can take 30 minutes for a new statistic to appear in reporting, but it's been almost 24 hours. How I can make my custom report work properly?

Thanks for your help.