Shared Mailbox with Different Domain

Occasional Visitor

I have a question about a shared mailbox and its domain. 
Currently, I have an outlook mailbox shared with my colleagues like
And my colleagues' e-mail addresses are, for instance,,,

Is it possible to add to our shared mailbox if is the outlook email? 
If possible, does anyone know how to add? 


1 Reply
As long as you have the domain added and verified in the same tenant, yes, it's possible.