I have the same issue. I'm on the Victoria distro of Splunk cloud. I opened a ticket with Splunk support and they say that the KV Store/Service is already enabled and running on our stack and to go to proofpoint to fix. I can't install an older version of the app to see if it works because I'm on cloud. Proofpoint initially tried to kick it back to splunk saying it's a splunk issue, so I don't know what else to do. I tried uninstalling and reinstalling the app, restarting the cloud stack, etc, so I'm basically stuck.
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