While using PowerShell to set up free/busy requests on Exchange, you receive the following message: GetUserAvailability Error:
Microsoft.Exchange.InfoWorker.Common.Availability.AddressSpaceNotFoundException: Configuration information for forest/domain xxx.com could not be found in Active Directory
You must add an available address space for your domain to instruct Office 365 to forward free/busy requests.
Please see the following article for step-by-step instructions:
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