Outlook/exchange 2010 "cannot expand folder" on shared mailbox

exchange 2010. outlook 2010 (and outlook 2013).
change user mailbox 'mailbox1' to a shared mailbox with powershell:
           set-mailbox mailbox1 -type shared
verify the mailbox appears as shared in exchange console.
grant Full Access Permission to mailbox1 to Group1 AD group.
member of Group1 adds mailbox1 as an additional mailbox to his outlook exchange account.
when he clicks on mailbox1, outlook says "cannot expand folder. (was this information helpful?)"
member of ad group logs out of windows and logs back in repeatedly.
but when he clicks on mailbox1, outlook says "cannot expand folder. (was this information helpful?)"
 edit: if I specifically grant full access permission to the user, he can open the mailbox in outlook. I want to grant the permission to a group, not to individual users.

Hi,
I can give a security group full access permission to a shared mailbox in my Exchange 2010 environment. And all group members can add the shared mailbox as an additional mailbox in Outlook.
Please make sure the full access permission has been assigned to Group1 and the problematic user is a member of this group. Then remove the additional mailbox and restart Outlook, re-add the shared mailbox as an additional mailbox to have a try. If the issue
persists in Outlook, please try to open the shared mailbox in OWA to check whether the user can access it.
Thanks,
Winnie Liang
TechNet Community Support

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    Our helpdesk has a shared mailbox used for users to submit issues.  Up until a week ago, all of the helpdesk techs could send-as the shared mailbox.
     Now when they attempt to send as the shared mailbox via Outlook they get the error "You do not have the permission to send the message on behalf of the specified user.".  When I attempt to manage send as permission via EMC (using an account
    with Domain Admin privileges) I've found that the list of users who can send as is blank.  When I attempt to add send as permissions via EMC I get the error below:
    domain\username
    Failed
    Error:
    Active Directory operation failed on DC1.xxxxxx.local. This error is not retriable. Additional information: Access is denied.
    Active directory response: 00000005: SecErr: DSID-031521E1, problem 4003 (INSUFF_ACCESS_RIGHTS), data 0
    The user has insufficient access rights.
    Click here for help... http://technet.microsoft.com/en-US/library/ms.exch.err.default(EXCHG.140).aspx?v=14.3.195.1&t=exchgf1&e=ms.exch.err.Ex6AE46B
    Exchange Management Shell command attempted:
    Add-ADPermission -Identity 'CN=account,DC=xxxxxx,DC=local'
    -User 'domain\username' -ExtendedRights 'Send-as'
    Elapsed Time: 00:00:00
    Anyone have any advice to fix this issue?
    Thanks in advance for your help.

    I got this sorted.  Here's the fix:
    On the problem account:  Open up active directory > Select the target user account > properties > Security Tab > advanced button.  If
    you cannot see the Security tab you have to go to view > advanced features
    On the Permissions tab put a check mark in Allow inheritable permissions from
    the parent and click ok

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