Unable to manage SendAs permissions on shared mailbox

This morning when we came in all of the sendas permissions for our helpdesk mailbox were missing.   When I try to add them with the Exchange console I get a message that says the user does not have sufficient permissions.
We are Exchange 2010 running on 2008R2,  Active Directory is 2008 native.
I added the sendas permission for the users from Powershell and they now show up in the console but they still cannot sendas the user.  I read another post that says we need to wait for replication and I will wait.
My question is what is causing the permissions error?  We also get it when we try to remove an error.

Hi,
From your description, I recommend you follow the steps below to ensure that this send as permission is granted successfully.
Open ADUC -> View -> Advanced Features -> right click user1 -> Properties -> Security -> make sure user2 is listed in the "Group or user names" and allow "Send as" permission.
If no, please add user2 to it and select "Send as" Allow to check the result.
Note: Please change user1 and user2 to the users you need.
Hope this can be helpful.
Best regards,
Amy Wang
TechNet Community Support

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