SSL inspection and Word 2016 - Insert "Online Pictures"

Hey!

Having a bit of trouble with Word 2016 and the Insert "Online Pictures" tab. At least 60% of the images(Bing image search) are blank when deep-inspection is applied to the FW policy.. You can still insert the blank image, but not all that useful when scrolling through hundreds...

I've added a lot of exemptions recommended by microsoft and bing but still no luck. No web/app blocks and/or session drops present anywhere. Returning the SSL Option back to "certificate-inspection" on the FW policy - images load fine.  "autodiscover.domain.com" has been added to web rating overrides to at least have some visibility to the "Online Pictures"

Before really tearing it down...was hoping someone has come across this and can share a quick and dirty fix?

 FortiGate 501E,500D,300D,100D,61Erunning 5.4.8

Thanks

B