Exchange 2026 Calendar Permissions Not Working Unbelievable. When working with exchange online, sometimes you'll come across issues in sharing calendars with others. Unable to add calendar permission over a mailbox in exchange online and got the error message:

When the user attempts to view calendar folder permissions from the outlook 365 desktop app, the hourglass spins for awhile. Now if they try to add or edit an entry within outlook (office 365) they get 'you don't have permissions to create an entry.' if. Permissions to the resource calendar were set up years ago by assigning permissions through the properties tab in.
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