question on office 365

Dear experts,

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 username@office365.microsoft.com.

What suggestions do you have to fix that? I want everyone to login user their domain account which is username@gts.ca. I have admin rights to the portal but don't want to make a change with out expert advice.
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Habib ZakariaNetwork Solutions ArchitectAsked:
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Vasil Michev (MVP)Commented:
You need to verify the domain gts.ca in Office 365 if you havent done so already. After that, you can change the UPN by going to the Users -> Active page, double-clicking the user and going to the Details page.

If you have lots of users you can automate this with PowerShell. Or better yet, use directory synchronization so that the attributes from the on-prem AD are synced to O365. It can also allow you to use the same password, or deploy Single-Sign on solution. Here's an example article: https://azure.microsoft.com/en-us/documentation/articles/active-directory-aadconnect/
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Habib ZakariaNetwork Solutions ArchitectAuthor Commented:
I thought it is simple as just renaming the domain in the portal and make sure the users use the same password for both AD and Microsoft cloud.
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Habib ZakariaNetwork Solutions ArchitectAuthor Commented:
Is there another way.
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Vasil Michev (MVP)Commented:
And what's from stopping you from renaming that domain to microsoft.com or similar? You can only use domains you own, thus the verification process. As for passwords, the Office 365 password policy (https://msdn.microsoft.com/en-us/library/azure/jj943764.aspx) will most likely be different compared to the on-prem one, so while the users might have the same passwords now, they will most certainly end up with different ones in the long run.
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Mark GalvinManaging Director / Principal ConsultantCommented:
Hi

What you need to do is change the Default Domain Name in Office 365:
https://support.office.com/en-GB/article/Change-your-default-domain-for-email-in-Office-365-1bd69e1c-9598-49ce-b341-9ac895dbe681

Thanks
Mark
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