TF400813: Resource not available for anonymous access (or) User is not authorized to access this resource
Issue : Microsoft.VisualStudio.Services.Common.VssUnauthorizedException: TF400813: Resource not available for anonymous access. Client authentication required (or) User is not authorized to access this resource
Solution : This error is mostly due to permission and authentication issues. Either you don’t have permission to access a certain resource because of the license levels or you are not even part of the organization from which you are trying to access the resource.
The only way to fix this issue is to contact the Project Collection Administrator of Azure DevOps and make sure you have all the access & permissions required to access the particular resource. Even if you are a project collection Administrator you can even deny yourself access to certain resources so make sure all the permissions are right for your user profile