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I am using Office 365 with Outlook for Mac 16.29 on 10.14.6.
In OWA I can use Office 365 Message Encryption (OME) but in Outlook the option is greyed out. On the other hand, my colleague can use it in Outlook and OWA and I can ready OME Mails, so it is not a limitation of the Mac app.
How do I get OME working in Outlook for Mac?