Create Modern Team Site Code

using Microsoft.Online.SharePoint.TenantAdministration;
using Microsoft.SharePoint.Client;
using OfficeDevPnP.Core.Sites;

using (ClientContext ctx = new ClientContext(<TenantAdminUrl>))
{
  // create new "modern" team site at the url
  // https://[tenant].sharepoint.com/sites/mymodernteamsite
  string alias = taskParam.TargetWebUrl.Substring(Url.LastIndexOf('/') + 1);
  
  // Before creating let's make sure the site doesn't exist
  bool exists = false;
  Task existtask = Task.Run(async () => exists = await ctx.AliasExistsAsync(alias));
  existtask.Wait();
  
  if (!exists)
    {
        log.Info("Creating site with a new Async method");
        TeamSiteCollectionCreationInformation teamSiteCreation = new TeamSiteCollectionCreationInformation();
        
        // Provide the team site para
        teamSiteCreation.Alias = <GroupAlias>;
        teamSiteCreation.DisplayName = <WebTitle>;
        teamSiteCreation.IsPublic = <true or false>;
        teamSiteCreation.Description = <Description>;
        ClientContext teamcontext = ctx.CreateSiteAsync(teamSiteCreation).GetAwaiter().GetResult();
        teamcontext.Load(teamcontext.Web, w => w.Lists, w => w.Url);
        teamcontext.ExecuteQueryRetry();
        
        //Call the Ensure Site Assets Library method to initialize the Site Assets library
        teamcontext.Web.Lists.EnsureSiteAssetsLibrary();
        teamcontext.ExecuteQueryRetry();
        log.Info("The site has been successfully created at: " + teamcontext.Web.Url);
    }
  }