Add a Federated Trust using powershell for a Hybrid Environment
-Production on-premies powershell
PS H:> Get-FederationInformation -DomainName Friendly.onmicrosoft.com -BypassAdditionalDomainValidation | New-OrganizationRelationship “Friendly Online” -FreeBusyAccessEnabled $true -FreeBusyAccessLevel AvailabilityOnly
-Production cloud powershell
PS H:> Get-FederationInformation -DomainName Friendly .onmicrosoft.com -BypassAdditionalDomainValidation | New-OrganizationRelationship “Friendly Online” -FreeBusyAccessEnabled $true -FreeBusyAccessLevel AvailabilityOnly
-From outside company powershell
PS H:> New-OrganizationRelationship -Name “your company” -DomainNames “your company”.mail.onmicrosoft.com, “your company”.onmicrosoft.com,”Your company”.edu -FreeBusyAccessEnabled $true -FreeBusyAccessLevel AvailabilityOnly -TargetApplicationUri outlook.com -TargetAutodiscoverEpr https://autodiscover-s.outlook.com/autodiscover/autodiscover.svc/WSSecurity -Enabled $true
*NOTE: cloud to cloud free busy search you will have to use the target addresses e.g someone@company.mail,onmicrosoft.com