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Missing User Profile: An Office or macOS update (due to a glitch) can remove your Mac user profile from the Outlook application and thus you are left with no read/ write permission to the Outlook.Outdated macOS of Your System: If your Mac is missing an essential OS update, it can conflict with the latest version of Outlook and thus cause the permission issue.Outdated Outlook Installation: The Outlook application (like other Office applications) is continuously updated and if you missed an Outlook update, it can render your Outlook installation incompatible with the macOS and thus cause the conflict, resulting in the issue at hand.
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