Add or change Ownership of a Office365 mailbox

This is one of the strange behaviour in O365, you might had seen this error while trying to change the ownership of a O365 mailbox as

You don’t have sufficient permissions. This operation can only be performed by a manager of the group.

To resolve this error, connect to O365 via PowerShell (how-to) to change the ownership

Set-DistributionGroup “IT Support Mailbox” -ManagedBy “adminuser@hackandsecure.com” -BypassSecurityGroupManagerCheck

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