"Add Filter" in Application Insights is disabled for Metric "Queue" and Aggregate "Avg".

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I downloaded and built this with VS2019 and it seems to be running and sending data, but when I try to look at the Metrics, following the ReadMe instructions and selecting Metric "Queue", the "Add Filter" option is disabled with the tooltip "Filter is not supported for the selected metric(s). Filtering includes, or excludes, certain values of a dimension in the result set."

Is there some change needed to the code or some configuration I've missed?
I've updated all NuGet packages referenced with no change in behaviour.