If possible (as a test) you can use appid:any and service:any and enable log on session start AND session end.
Then take a peak in the traffic log to see how the traffic is being identified, lets say "sharepoint" (or whatever).
Finally change this rule from any into appid:sharepoint (or whatever you found), service:application-default (or manually specify which TCP/UDP ports you wish to allow) and disable "log on session start" (just keep log on session end).
Dont forget to enable the IPS while your are at it (in the options).
Edit: And if you have SSL traffic you should take a look at enabling SSL-termination so the PA device can inspect the encrypted data aswell...
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