If you're having trouble with office 365 calendar not syncing, you may reach out to us. To speak with one of our professionals, you may use our live chat support facility or call our toll-free number. Our service professionals are accessible 24 hours a day, 7 days a week to assist you in resolving the issues that you are encountering when attempting to restore data from your email account.

https://www.limksys.com/office-365-shared-calendar-syncing