Which is the valid email address for our sharepoint team site's group; the one which have “onmicrosoft” in it or the one which does not have it

Question

I have created a new sharepoint team site as follow:-

and i got an office 365 group created for me. now i am getting 2 different email addresses for my office 365 group and team site, as follow:-

1. When i hover over the sharepoint site name, i got this email address (without onmicrosoft) @ HRManagers@ourcompany.com, as follow:-

2. While if i access the office 365 group which get created automatically, from "office 365 admin" >> "Group", i got this email address (with onmicrosoft in it) @ HRManagers@ourcompany.onmicrosoft.com, as follow:-

So which email address is the valid one?

NOTE:- We have 2 domains as follow:-

Answer 1

Both addresses are valid; every object gets a @.onmicrosoft.com address.