Microsoft Word Online not working with HTTPS Packet inspection switched on

Question

So we Decrypt & scan HTTPS traffic and we have a few exceptions setup for things like Spotify web which were being problematic for us. 
 We do have an issue at the moment with Microsoft Word Online not working with the Dictation feature. If you look at the below image it shows the error. When you click on the dictation tool it comes up with "We failed to connect to the Microsoft Speech Service. Please try again." 
 
 As soon as I switch off the "Decrypt & Scan HTTPS Traffic" it works immediately. 
 I am not sure how to go about testing what to do here. I already added exceptions from this here: 
 https://community.sophos.com/kb/en-us/132291 
 Any advice on how to determine what is going on here would be much appreciated. 
 Thanks

Keyur · Accepted Answer

Hi David Ashcroft

Please go to Log Viewer >> Select Logs for Web from the drop-down menu, apply a filter for the specific IP address to sort and try to access Microsoft Word online from the system and check for denied logs.

Please refer to the article- https://docs.microsoft.com/en-us/office365/enterprise/urls-and-ip-address-ranges, It contains URLs to allow, You may create custom web category and allow these URLs to Web filter policy.

Regards,