Grant 'Reviewer' rights for all users in Office 365

With the use of PowerShell, I would like to grant the user "Joe Bloggs" Calendar Reviewer rights for all users.
   
Thank you.
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the_omnificAsked:
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Jason CrawfordTransport NinjaCommented:
First connect to Exchange Online using Powershell:

$LiveCred = Get-Credential
$Session = New-PSSession -ConfigurationName Microsoft.Exchange -ConnectionUri https://ps.outlook.com/powershell/ -Credential $LiveCred -Authentication Basic -AllowRedirection
Import-PSSession $Session

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Next add the permissions:

$users = Get-Mailbox -ResultSize Unlimited
$users | ForEach-Object {
    Add-MailboxFolderPermission $($_.alias + ':\calendar') -User 'Joe Bloggs' -AccessRights Reviewer
}

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the_omnificAuthor Commented:
This is what I get when I run your command;
 
Not working
Jason CrawfordTransport NinjaCommented:
Did you add permission for Mark Lampson instead of Joe Blogs?  The errors you see indicate an existing permission already existed for Mark Lampson, in which case no further action is required unless you want to change the level of permission applied.
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