When using WS-Federation on the Office 365 app, at least one domain must be added to start the federation process. Multiple domains can be added when federation is enabled for the first time or later.

• Microsoft Office 365
• Federation (WS-Federation)
• Add domain

To add a domain to an already existing WS-Federation Office 365 app, follow these steps:

1. Click on the Sign On tab of the Office 365 app.

2. Click on Edit.

3. Scroll down until the Fetch and Select option is seen and click on it.

4. Once the pop-up appears, type the domain's name intended for federation and select it when it appears.

5. Click Select when done. Make sure to click the Save button at the bottom of the page.

NOTE:

• If a subdomain is added to an Office 365 domain that is federated with Okta, it is expected that the subdomain will not appear in the Domain field after using the Fetch and Select button. To apply the federation settings to the added subdomain, simply click on the Fetch and Select button and save the configuration without making any changes.
• If the Fetch and Select button is not present on the UI, an additional feature is required. Please contact Okta Support to further enable this functionality.

Related References

• How to Disable Office 365 Federation Made Through PowerShell
• How to remove Office 365 Federation using the Okta UI
• Federate multiple Office 365 domains in a single app instance
• Configure Single Sign-on with WS-Federation - manual method