When starting Outlook and using the Cryptshare for Office 365 & Outlook Add-in, one or more shared mailboxes are not recognized by the add-in. This can be seen when opening the Cryptshare for Outlook settings: not all shared mailboxes are visible.
According to Microsoft, the Outlook profile is corrupt. When inspecting the trace files one of following error code appear multiple times:
For more information you can take a look to the Microsoft KB article: https://support.microsoft.com/en-au/help/2659085/error-0x8004010f-when-you-try-to-send-or-receive-email-in-outlook-2010
Follow the resolution as described in the Microsoft support article: https://support.office.com/en-us/article/create-an-outlook-profile-f544c1ba-3352-4b3b-be0b-8d42a540459d