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 firstname.lastname@example.org
User2 is in subdomain B.domain.local and has email address email@example.com
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 firstname.lastname@example.org -AccessRights LimitedDetails
We get the following error:
The user "FirstName Lastname email@example.com" 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 : exc01.domain.com
Can you please help us solve this problem?
Thanks in advance for your help.