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"\r\n\r\nIt is not supported to combine separate tenants into one portal. But here are some options available for managing multiple tenants:\r\nYou can set up as a Microsoft partner to manage multiple tenants on one dashboard in Partner Center.\r\nReference: How To Manage Multiple Microsoft Office 365 Tenants For MSPs.\r\nUse Microsoft 365 inter-tenant collaboration if you need collaboration.\r\nReference: Office 365 inter-tenant collaboration: Sharepoint and OneDrive.\r\nManually Import/Export mailbox or use third-party tools such as Stellar Converter for EDB.\r\n"
<http://28r39jd.x.incapdns.net/topic/2458342-merging-multiple-m365-users-into-one-user?from_forum=207>