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Prevent the creation of Office 365 Groups
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Create the policy
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New-OwaMailboxPolicy -Name “OwaMailboxPolicy-O365Groups”
Set-OwaMailboxPolicy -GroupCreationEnabled $true -Identity “OwaMailboxPolicy-O365Groups”
 
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Set the parameter to the default policy
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Set-OwaMailboxPolicy -GroupCreationEnabled $false -Identity “OwaMailboxPolicy-Default”
 
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Assign the policy
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Bulk
Get-Mailbox -resultsize unlimited | where {$_.CustomAttribute15 -eq "Staff"} | Set-CASMailbox -OwaMailboxPolicy OwaMailboxPolicy-O365Groups
 
Single
Set-CASMailbox -identity user.name@domain.co.uk -OwaMailboxPolicy:OwaMailboxPolicy-O365Groups
 
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Remove the policy
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Set-CASMailbox -identity user.name@domain.co.uk -OwaMailboxPolicy:$null