unable to send as from a shared mailbox

I had this question after viewing Sending message failure.

I've tried Blue Street Techs accepted solution of removing the Save As permissions and adding them back, but I'm still getting the error message :
            This message could not be sent. Try sending the message again later, or contact your network administrator. You do not have the permission to send the message on behalf of the specified user. Error is [0x80070005-0x0004dc-0x000524].

the problem account is a shared mailbox.  Is there something that I'm missing?
Kelly Denise HortonConfiguration Management AnalystAsked:
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Todd NelsonSystems EngineerCommented:
If the "Send As" delegated permissions doesn't work, try adding "Full Access" rights.
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viktor grantExchange ServersCommented:
Hi Kelly,

Could you try to add the right "send on behalf" too and send again the email.

Where are you trying to send the email via Outlook or OWA?

Cheers
Viktor
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viktor grantExchange ServersCommented:
No more replies from the author...issue seems to be solved
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