Outlook Add-In in Shared Mailbox Timeout

Question

Hello, 
 We have installed the add-on for Outlook from Sophos. This was rolled out to all devices via an XML through the M365 admin center. In this XML I have already added the following:

The following error pattern: If I report a mail in my personal mailbox everything works fine. 
 However, if I want to do this within a Shared Mailbox (No User) it loads for 3-4 minutes (First picture) and then runs into a timeout (Second Picture).

Microsoft Outlook Version: 2212 Build 15928.20216 
 Exchange in Hybrid Status (Local & Exchange Online) 
 Mailboxes are located in Exchange Online 
 
 Does anyone have the same error? 
 Thanks a lot!

Qoosh · Answer

Hi Nico , 
 I was not able to locate documentation indicating whether shared mailboxes are supported with the Phish Threat plugin. 
 I'd suggest opening a support case to inquire further into this with our team. I will also reach out internally to inquire about this and update this thread. Update: This appears to be a limitation from Microsoft's side.