title: Multi-Tenant Azure AD Auth in Azure AD B2C with Custom Policies
body: <p>I am trying to use Azure AD Auth in Azure AD B2C using the /common Azure AD enpoint. According to <a href="https://docs.microsoft.com/azure/active-directory/develop/active-directory-devhowto-multi-tenant-overview#update-your-code-to-handle-multiple-issuer-values" rel="nofollow noreferrer">How to sign in any Azure Active Directory (AD) user using the multi-tenant application pattern</a>, there needs to be a mechanism to either:</p>
  
  <ol>
  <li>Allow multiple issuers, or</li>
  <li>Specify a list of issuers b2c can validate against.</li>
  </ol>
  
  <p>I do not see any possible setting in the custom policies XML that would allow this. I was able to get Azure AD auth created successfully in my TrustFrameworkExtensions.xml file, just not multi-tenant now. </p>