Exchange 2013 ApplicationImpersonation role You don't have permission to open this mailbox.

Hi Guys,

I am trying to get and account to work with applicaitonImpersonation. 

I have run through the setup and tested multiple account. No account are domain admin. yet I cannot use the impersonation account to access a user mailbox. I am testing by user webmail.domain.local\username@domain.local

This is the command I use to create the account.

New-ManagementRoleAssignment -name:Uniquename -Role:ApplicationImpersonation -User:Username

If I do Get-ManagementRoleAssignment Uniquename it show the correct results. 

Does anyone have any ideas why this would not be working?

Anyway to test the permission?

Anyway to fix the issue?

Thanks for your time.

Craig 

Craig G