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I have a Domain site from 1&1 , and i successfully configured it with office 365, but after that I'm not able to rename my site with the new domain?
Could someone help me?
Log into Office 365 admin, select SharePoint at left menu, click 'Site collections', select public your site & press Rename Website at the Ribbon. It only gets activated if it's public website, not usual *.sharepoint.com
If you're talking about the actual tenancy, that is 'example.sharepoint.com', this cannot be renamed. You would have to purchase a brand new O365 tenant and migrate all content over to the new tenant.
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