Send as is not working when mailbox is hidden from address list

Hi all,

Does anyone know or have any valid documentation if this is by design?

I created 3 shared mailboxes and granted 3 users access to each of these.

2 of these shared mailboxes does not work to send as when they are hidden from address list, but one of them is working.

Can anyone confirm if this should be working?

According to MR Cunningham, this should work if add the mailbox as contact : http://exchangeserverpro.com/how-to-send-as-a-hidden-mailbox/

In my case it does not work for those two mailboxes.

Thanks!

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