title: How do i register a security key (for windows log-in) for my regular Microsoft accounts?
body: <p>To break the problem down, all I am trying to do is use a security key (FIDO2 security key) with my Microsoft account (hotmail) to log into my PC. Does anyone know how I can best do this?</p>
  <p><strong>Details of my attempt using Azure AD:</strong></p>
  <p>I have an AAD tenant where security keys have been enabled for all users. When creating a user in AAD, setting up the key for that user in <a href="http://myprofile.microsoft.com/" rel="nofollow noreferrer">http://myprofile.microsoft.com/</a> and then AAD joining my PC, I can login to my PC with the registered security key to that particular account.</p>
  <p>However, if I invite an external user with a regular &quot;@outlook&quot; or &quot;@hotmail&quot; account to my AAD, I cant login to <a href="http://myprofile.microsoft.com/" rel="nofollow noreferrer">http://myprofile.microsoft.com/</a> since this user is not added to the &quot;Microsoft Services&quot; tenant and can not access application '19db86c3-b2b9-44cc-b339-36da233a3be2'(My Access). Instead I tried setting up the security key in account.microsoft.com for microsoft accounts.</p>
  <p>Since my PC is AAD joined with the AAD user, the security option is there during login and with that I tried signing in to my &quot;@hotmail&quot; account on my PC with the security key I set up for that account. That seemed to initially work until it finally said &quot;You can't sign in with this account. Try another account&quot;</p>
  <p>Does anyone know how to set up security keys for regular microsoft accounts or how to possibly add an external to the 'Microsoft Services' tenant?</p>
  <p>Thanks!</p>