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Cross-premises Calendar viewing is unavailable in a hybrid deployment of Exchange Online in Office 365 and on-premises Exchange Server

We have a hybrid config., with some mailboxes in Office 365, and some mailboxes on-premise.

An Office 365 mailbox cannot view the calendar of an on-premise mailbox, and vice verse.

Error in Outlook trying to open a shared calendar ‘could not be updated’

Error in Outlook trying to view calendar of another mailbox using Scheduling assistant  ‘could not be updated’ as below screen

Error in OWA opening a shared calendar ‘This folder couldn’t be opened.  You might not have permission to open it, or it might not exist anymore’

FreeBusy on outlook 2013

Now the solution will be to run the both command on the exchange server:

Set-AutodiscoverVirtualDirectory “SERVER\Autodiscover (Default Web Site)” -WSSecurityAuthentication $True

Set-WebServicesVirtualDirectory -identity “EWS (default web site)” -WSSecurityAuthentication $true

This two command solved my problem

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