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Does the Domain admin account have a mailbox?
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There are 4 accounts part of 'Domain Admins' and all four have mailboxes
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Open Exchange Management shell and run the following to verify if your user has rights<br><br>Get-MailboxPermission "sharedmailboxemailaddress" | Select User,AccessRights<br><br>
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Arun get the mailbox database servername that holds the mailbox and run the below command to add the domain admins<br><br>get-mailboxdatabase -server "&lt;servername&gt;" | add-adpermission -user "Domain Admins" -AccessRights GenericAll
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Executed the cmd<br>Domains Admins - FullAccess<br><a href="https://filedb.experts-exchange.com/incoming/2020/05_w19/1453612/1588837062374.png" rel="ugc"><img src="https://filedb.experts-exchange.com/incoming/2020/05_w19/1453612/1588837062374.png" class="fr-fic fr-dib"></a><br>
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Arun get the mailbox database servername that holds the mailbox and run the below command to add the domain admins<br><br>get-mailboxdatabase -server "&lt;servername&gt;" | add-adpermission -user "Domain Admins" -AccessRights GenericAll &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <br><br>
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Executed and received WARNING: The appropriate access control entry is already present on the object.<br><br>
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1. &nbsp;I want you to open up webmail with the domain account<br>2. &nbsp;At the top right click your initials and then "open another mailbox"<br>3. &nbsp;Enter the email address of the mailbox and see if it opens up<br><br>
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When accessed from any member of 'Domain Admins' who also has mailbox<br>Note: Issue is accessing to only 1 mailbox, no issues when accessing mailboxes &nbsp;of any other other mailboxes on same Exchange DB<a href="https://filedb.experts-exchange.com/incoming/2020/05_w19/1453643/1588840869579.png" rel="ugc"><br><img src="https://filedb.experts-exchange.com/incoming/2020/05_w19/1453643/1588840869579.png" class="fr-fic fr-dib"></a><br>
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Senior Manager - IT Operations

Arun Kumar V

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When executed:&nbsp;Remove-MailboxPermission "emailaddressofthemailbox" -User "Domain Admins"&nbsp;<em>-Deny -InheritanceType ‘All’ -AccessRights ‘FullAccess’</em>&nbsp; (used actual email address)<br><br>the result I am seeing is: "WARNING: An inherited access control entry has been specified: [Rights: CreateChild, ControlType: Deny] &nbsp;and was ignored on object "
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look in ADSIEdit in the Configuration section for Exchange and check where your rights are applied at. See Configuration, Services, Microsoft Exchange, &lt;org name&gt; and look at the Security permissions at that level.<br><br>&nbsp;two properties you can remove deny rights is Send-As and Receive-As , this will give you full Mailbox permissons and Send As &nbsp;permission on the mailbox.
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Reference link to get in to adsiedit<br><a href="https://documentation.commvault.com/commvault/v11_sp14/article?p=28840.htm" rel="ugc">https://documentation.commvault.com/commvault/v11_sp14/article?p=28840.htm</a><br><br>
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I am able to access the mailbox, thank you FOX for the consistent help that resolved the issue
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Unable to access\connect to a user mailbox even when having full-access rights and also inherited accounts that have Full Access<br />
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Exchange Server 2016 <br />
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When accessing with any of the 'Domain Admin' accounts message read 'You don't have permission to open this mailbox', have already removed and re-added the permissions but still receiving same deny.
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Unable to access\connect to a user mailbox even when having full-access rights and also inherited accounts that have Full Access

Exchange Server 2016 

When accessing with any of the 'Domain Admin' accounts message read 'You don't have permission to open this mailbox', have already removed and re-added the permissions but still receiving same deny.

Unable to access a mailbox with Full Access and inherited permissions

Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.