Dmc Service error Citrix.Dmc.Common.ConfigurationException: No sites could be accessed is seen in Director IIS and CDF logs.
Fix or remove the broken/unresolved SID in the "Impersonate a client after authentication" group policy.
In most cases, this configuration has no impact. However, if you have installed optional components such as ASP.NET or IIS, you may need to assign the Impersonate a client after authentication user right to additional accounts that are required by those components, such as IUSR_<ComputerName>, IIS_WPG, ASP.NET, or IWAM_<ComputerName>.
https://www.citrix.com/blogs/2021/01/13/citrix-tips-piv-key-smart-card-auth-for-citrix-director/