Enter the resource name and either select it from the automatic look up list or click Search Contacts. Click your name in the top right corner and select Open another mailbox from the dropdown list. Log into Office 365 account via Outlook on the web. Contact your domain administrator to find out who the primary owner of a resource is.Microsoft Office comes with a tool to configure and manage volume licenses called OSPP.vbs (Office Software Protection Platform).
In case you installed Office 365 on a computer which contained a previous version of Office, there is a chance that older licenses are still registered and causing the activation issues.
