You can view a list of devices that have logged into your account, and revoke any SSO sessions that you don't recognize.
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In the upper-right corner of any page on GitHub, click your profile picture, then click Settings.
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In the "Access" section of the sidebar, click Sessions.
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Under "Web sessions," you can see your active SSO sessions.
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To see the session details, next to the session, click See more.
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To revoke a session, in the session details, click Revoke session.
Note
When you revoke a session, you remove your SSO authentication to that organization. To access the organization again, you will need to single sign-on through your identity provider. For more information, see About authentication with single sign-on.