
User16179005967591881561 (Customer) asked a question.
I have a situation where the default domain xyz.com is set as the default domain instead of the xyz.onmicrosoft.com domain. We want to setup Federation for SSO, but that would require changing the default domain. Since I have no history of why the change was done, I would hate to change the default domain to accommodate Okta.
Any thoughts would be appreciated.

Hello @User16179005967591881561 (Customer),
Please check the following link with information: https://help.okta.com/en/prod/Content/Topics/Apps/Office365/multiple-domains-support.htm
Also, there are more discussions about this topic that you can check:
https://support.okta.com/help/s/question/0D51Y00009hMJndSAG/office-365-default-domain-best-practices?language=en_US
https://support.okta.com/help/s/question/0D51Y000067BlpP/office-365-default-domain?language=en_US
Regards,
Natalia
Okta Inc.