Predict command not working with eval count.

Splunk Search

I have the following query that I am working to establish a prediction for. I am able to be the volume to predict but I wanted to also predict a failure rate for this. When I add in the failure count though I do not get any results. I confirmed the query works fine when removing the predict also. Is this a limitation on predict?

|timechart span=15m count as volume, count(eval(match(login, "failure"))) as "failures"
| predict volume, failures

I also see, "Invalid time series index: 2".

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