I was trying to add someone to an Exchange Online distribution group and got the following error:
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Ex8155FB|Microsoft.Exchange.Configuration.Tasks.ManagementObjectAmbiguousException|There are multiple recipients matching the identity "abc@def.com". Please specify a unique value. |
The solution for this is to do a search like this:
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Get-EXORecipient -ResultSize unlimited | Where-Object { $_.EmailAddresses -match "<part of the address>" } | Format-List Alias,Name,DisplayName,@{Name="EmailAddresses";Expression={$_.EmailAddresses -join ';'}} |
That will show you the conflicting Exchange objects. Removing the offending one, or use the
Id property to add the user.