In CloudSOC -> Investigate, Yammer events are not showing, or only some events are showing like Login events, but not Upload or Download events
Yammer Gatelet monitors the following URLs.
In WSS console, go to Policy -> TLS/SSL Interception -> TLS.SSL Interception Policy and review all the rules listed there. Ensure that there are no policies that monitor any of those URLs above where the Verdict is Intercept.
Also go to Connectivity -> Bypassed Traffic -> Bypassed Domains, and ensure that none of the above URLs are bypassed.
Go to Policy -> CASB Gatelets, and verify the Yammer Gatelet is listed.