troubleshooting Question

Need help resolving error when managing mailbox folder rights for users in different subdomains in Exchange 2016

Avatar of Blaise Fournier
Blaise FournierFlag for Switzerland asked on
ExchangeActive Directory
10 Comments1 Solution116 ViewsLast Modified:
We have trouble adding rights to the calendar folder of one user to another user who is on another subdomain.
We run Exchange 2016 (Version 15.1 (Build 1466.3) and have a main domain we will call domain.local and 5 subdomains. Exchange server is in domain.local.
User1 is in subdomain A.domain.local and has email address
User2 is in subdomain B.domain.local and has email address
We ran the following command to add LimitedDetails rights to B.domain.local\user2 on A.Domain.local user2’s calendar:
Add-MailboxFolderPermission -Identity A.domain.local\user1:\calendar -User -AccessRights LimitedDetails

We get the following error:
The user "FirstName Lastname" was found in Active Directory but isn't valid to use for permissions. Try an SMTP address instead.
+ CategoryInfo          : NotSpecified: (:) [Add-MailboxFolderPermission], InvalidInternalUserIdException
    + FullyQualifiedErrorId : [Server=XXXXXX,RequestId=XXXXXXX,TimeStamp=01.02.2019 10:31:07] [FailureCategory=Cmdlet-InvalidInternalUserIdException]XXXXXX,Microsoft.Exchange.Management.StoreTask
    + PSComputerName        :

Can you please help us solve this problem?
Thanks in advance for your help.
Best regards
Blaise Fournier
Systems Engineer

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