This ticket has been open a long time, but just in case someone else runs into it... Some people include workload specifications with the URL of a search they've done. When this occurs, and they share the link with others, then they can get this error if the other person does not have the right granted to them to select a workload pool. This most often happens when a Splunk admin shares a link with a non-admin. The fix is to remove any reference to a workload pool from the URL. Or, alternately, you can grant the role of the person running the search to allow them to list and select workload pools. But if you do the second one, then anyone with that role can select which workload pool they run in.
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