I have several linked mailboxes,   I have to delegate Full control of one mailbox, but  it as no effect.

 

I have try through ECP, adding FC for User alias, no effect.

I have try through Powershell :

Add-MailboxPermission -Identity " TestUser1@accout.com" -User "AccoutCom\TestUser2" -AccessRights FullAccess -InheritanceType All -AutoMapping $false

 

I have One way forest trust.

Hi,

Please give the user account Full access permission to the linked mailbox instead of linked account. We can try:

Add-MailboxPermission -Identity " TestUser1@ExchForest.com" -User "AccoutForest\TestUser2" -AccessRights FullAccess -InheritanceType All -AutoMapping $false

Then the TestUser2 in Account forest should has full access permission to TestUser1 mailbox in Exchange forest.

Regards,

Auto-mapping was the culprit

When I first try to assign FC, I  filed to add automating to $Fallse.  And at the end, I delete FC, and assign it again

• Marked as answer by MaliStane 15 hours 30 minutes ago