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Outlook 2019 for Mac, Cannot add Shared Calendars
Fresh Office for Mac 2019 install on a brand-new MacBook Pro 16" running macOS Catalina 10.15.3, and the Office apps are up to date. Whenever the user clicks the Open Shared Calendar button in Ou...
I have ran into this same exact issue yesterday, and have been trying everything I can to fix it. I have the same scenario as you, with an on-prem installation of Exch 2016. I'm assuming there was an update recently that broke this? Your post was the only thing I've found referencing this problem.