Give yourself full permissions on the entire mailbox database

Im trying to do a email migration with Transend software between Groupwise Linux 6.5.3 to Exchange 2010, I been having some difficulty with setting up > Add-ADPermission -Identity "Mailbox Store" -User "Trusted User"-ExtendedRights Receive-As  but for some odd reason Im receiving this error : There are multiple objects matching the identity "abc". Please specify an unique value.

So basically what other rights  and permissions am I missing
rhpnoobAsked:
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_13Connect With a Mentor Commented:
This is to add fullmailbox permission to all mailboxes of the mailbox database

get-mailboxdatabase "Database Name"| get-mailbox | add-mailboxpermission -user "Trusted User" -accessrights fullaccess
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