Note
You can require that all members and outside collaborators in your organization have two-factor authentication enabled. For more information, see Requiring two-factor authentication in your organization.
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In the upper-right corner of GitHub, click your profile picture, then click Organizations. 
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Click the name of your organization. 
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Under your organization name, click People.  
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To view organization members, including organization owners, who have enabled or disabled two-factor authentication, on the right, select Two-factor authentication, then click Secure or Disabled.  
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To view outside collaborators in your organization, in the "Organization permissions" sidebar, click Outside collaborators. 
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To view which outside collaborators have enabled or disabled two-factor authentication, above the list of outside collaborators, select Two-factor authentication, then click Secure or Disabled.