Can i claim another .onmicrosoft.com domain for our tenant

[Charlie Jones]

we have two legal entities that use the same tenant but have different names, is it possible to claim another .onmicrosoft.com domain? without setting up another tenant? 

[#2]

This recently become possible, sort-of. You can "add" additional onmicrosoft.com domains, but currently the verification part of the workflow is not yet exposed. https://www.michev.info/Blog/Post/3173/adding-multiple-onmicrosoft-com-domains-in-the-same-tenant