Let me explain you in more detail here.
I have created a user under the main account faisal(a)7v840c.onmicrosoft.com in the portal
admin.microsoft.com
The user created with the domain used for SBC is
abcsbc.com and the new user is
faisal.ahmad(a)abcsbc.com
This domain
abcsbc.com was verified from the main account faisal(a)7v840c.onmicrosoft.com
and I have added all the routes to my AWS domain registrar from Microsoft.
So what do you think now?