If anyone ever runs into this in the future and are having issues like I was, everything in this post applies but even though you are calling | inputlookup and your searching time frame doesn't apply to bringing back results, you do need to search over the range for the sparkline to form properly. Basically for a 30 days sparkline, making sure you run the search over the last 30 days even though its not actually searching 30 days of events.
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