I just joined a company that has office 365 and I am network guy but will be helping with Microsoft stuff and need some guidance.
first thing I noticed is that our domain is for example gts.ca but users are logging into office365 cloud using email@example.com.
What suggestions do you have to fix that? I want everyone to login user their domain account which is firstname.lastname@example.org. I have admin rights to the portal but don't want to make a change with out expert advice.