Perform these steps to disable federation on the AD FS side by deleting the Office 365 Identity Platform relying party trust:
- Log on to the AD FS server with an account that is a member of the Domain Admins group.
- Open AD FS Management (Microsoft.IdentityServer.msc).
- In the left navigation pane, under the AD FS node, expand the Relying Party Trusts node.
- In the main pane, select the Office 365 Identity Platform relying party trust.
- In the right Actions pane, click Delete, or right-click the relying party trust and select Delete from the menu:
- In the AD FS Management popup window, ...