Hi. You can verify your domain using the steps described here https://learn.microsoft.com/en-us/office365/admin/setup/add-domain?view=o365-worldwide
I need to verify my onprem domain with my O365 pulic facing domain for pass thru SSO

auldwoodroad
1
Reputation point
I need to verify my onprem domain with my O365 pulic facing domain for pass thru SSO
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Maarten van de Wiel 76 Reputation points
2019-11-22T14:44:15.35+00:00 Hi, Sounds like you'd like people to login to Office 365 with their onprem credentials. You can use AD-Connect to set this up.
Here is a link for the express settings.
https://learn.microsoft.com/en-us/azure/active-directory/hybrid/how-to-connect-install-expressPlease note that password reset and forgot password options are only availble with Azure AD Premium 1.
Good luck!