According to our test, the Okta TA 1.2.0 can works with Splunk 6.5.0.
For the timeout issue, the root cause might be the timeout 60 seconds is too short in your env. We will try to adapt the timeout dynamically in the future to handle case like this.
Per the start_date, the search and filter on Okta side may take more time if the volume is too big, so that the response is delayed. If you want to collect all the data (since 30 days ago), you can try to set a longer timeout time. Thanks!
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