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New-AvailabilityConfig

Use the New-AvailabilityConfig cmdlet to create the availability configuration that specifies the Microsoft 365 organizations to exchange free/busy information with. Exchange PowerShell reference

From the Exchange PowerShell reference 4 parameters Its page in the reference

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Parameters

4 in the Exchange PowerShell reference
-AllowedTenantIdsThe AllowedTenantIds parameter specifies the tenant ID values of Microsoft 365 organization that you want to share free/busy information with (for example, d6b0a40e-029b-43f2-9852-f3724f68ead9).
-Confirm, -cfThe Confirm switch specifies whether to show or hide the confirmation prompt.
-OrgWideAccountThis parameter is reserved for internal Microsoft use.
-WhatIf, -wiThe WhatIf switch shows what the command does without making any changes.