Administrator should manage domains as "sub-tenents" in isolation
Administrator should be able to manage each domain separately. For Example in One Drive, if you try to share a folder, the invitation list will show users in other domains. This also goes for sharing Sharepoint Team documents. Administrator should have administer each domain as a separate group (like sub-tenents) Creating a tenant for each client requires an additional Administrator license which is redundant. One tenant Administrator should be able to manage multiple small customers in separate domains as sub-tenants which can be totally isolated. If you have many small clients this is necessary. If you have an enterprise having domains for each unit, you may want a unit like R&D isolated, for example.
Amazing this is still a thing .... please fix this !!!
Dros M commented
Would be great in Education where you want business data to not be accessible by students but need them to be able to be in the same tenant under the same domain.
I believe Microsoft are working on something similar for your requests. Administrative units are to be used to assign out permissions based on the Helpdesk or administration role and can be scoped by domain using PowerShell
Omran NAJJAR commented
It would be very helpful specially for big organisations
This would be a very good feature. The 'sub-tenant' could be based on an Azure AD Group.
G Suite already has organisations and sub-organisations from what I'm aware!
Kim Lee commented
I belive this feature is a mandatory feature for all administrators who needs to manage more than one domain in office 365. Missing this feature leads to critical privacy and security problems. I wish Microsoft will look into this problem and fix it as soon as possible!