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One alternative is to subscribe to iCloud calendar with your Exchange/O365 email accounts or any Outlook account, and then sync the same accounts in Outlook for Mac. See details:Mark Aston supported this idea ·
An error occurred while saving the commentMark Aston commented
4 and a half years people have been asking for Outlook on Mac to fully support iCloud integration and that mainly means automatically syncing Apple Calendar with Outlook. How have you not done anything about this already. Like most people on here I am Mac centric but need the interoperability between Mac and Microsoft ecosystems. Please carry out this essential modification. The work-around you post does not work.