Recreate the migration.

templates/module/aspnet-core/host/MyCompanyName.MyProjectName.IdentityServer/Migrations/20191018080944_Initial.Designer.cs → templates/module/aspnet-core/host/MyCompanyName.MyProjectName.IdentityServer/Migrations/20191127124541_Initial.Designer.cs

@@ -10,7 +10,7 @@ using MyCompanyName.MyProjectName.EntityFrameworkCore;
 namespace MyCompanyName.MyProjectName.Migrations
 {
     [DbContext(typeof(IdentityServerHostMigrationsDbContext))]
-    [Migration("20191018080944_Initial")]
+    [Migration("20191127124541_Initial")]
     partial class Initial
     {
         protected override void BuildTargetModel(ModelBuilder modelBuilder)
@@ -1367,8 +1367,7 @@ namespace MyCompanyName.MyProjectName.Migrations
 
                     b.HasKey("Id");
 
-                    b.HasIndex("Name")
-                        .IsUnique();
+                    b.HasIndex("Name");
 
                     b.ToTable("AbpTenants");
                 });

templates/module/aspnet-core/host/MyCompanyName.MyProjectName.IdentityServer/Migrations/20191018080944_Initial.cs → templates/module/aspnet-core/host/MyCompanyName.MyProjectName.IdentityServer/Migrations/20191127124541_Initial.cs

@@ -820,8 +820,7 @@ namespace MyCompanyName.MyProjectName.Migrations
             migrationBuilder.CreateIndex(
                 name: "IX_AbpTenants_Name",
                 table: "AbpTenants",
-                column: "Name",
-                unique: true);
+                column: "Name");
 
             migrationBuilder.CreateIndex(
                 name: "IX_AbpUserClaims_UserId",

templates/module/aspnet-core/host/MyCompanyName.MyProjectName.IdentityServer/Migrations/IdentityServerHostMigrationsDbContextModelSnapshot.cs

@@ -1365,8 +1365,7 @@ namespace MyCompanyName.MyProjectName.Migrations
 
                     b.HasKey("Id");
 
-                    b.HasIndex("Name")
-                        .IsUnique();
+                    b.HasIndex("Name");
 
                     b.ToTable("AbpTenants");
                 });

templates/module/aspnet-core/host/MyCompanyName.MyProjectName.IdentityServer/MyCompanyName.MyProjectName.IdentityServer.csproj

@@ -17,7 +17,7 @@
     <ProjectReference Include="..\..\..\..\..\framework\src\Volo.Abp.AspNetCore.Authentication.JwtBearer\Volo.Abp.AspNetCore.Authentication.JwtBearer.csproj" />
     <ProjectReference Include="..\..\..\..\..\framework\src\Volo.Abp.AspNetCore.Mvc.UI.Theme.Basic\Volo.Abp.AspNetCore.Mvc.UI.Theme.Basic.csproj" />
     <ProjectReference Include="..\..\..\..\..\framework\src\Volo.Abp.AspNetCore.Mvc\Volo.Abp.AspNetCore.Mvc.csproj" />
-    <ProjectReference Include="..\..\..\..\..\framework\src\Volo.Abp.AspNetCore.MultiTenancy\Volo.Abp.AspNetCore.MultiTenancy.csproj" />
+    <ProjectReference Include="..\..\..\..\..\framework\src\Volo.Abp.AspNetCore.Mvc.UI.MultiTenancy\Volo.Abp.AspNetCore.Mvc.UI.MultiTenancy.csproj" />
     <ProjectReference Include="..\..\..\..\..\framework\src\Volo.Abp.Autofac\Volo.Abp.Autofac.csproj" />
     <ProjectReference Include="..\..\..\..\..\framework\src\Volo.Abp.EntityFrameworkCore.SqlServer\Volo.Abp.EntityFrameworkCore.SqlServer.csproj" />
     <ProjectReference Include="..\..\..\..\..\modules\account\src\Volo.Abp.Account.Web.IdentityServer\Volo.Abp.Account.Web.IdentityServer.csproj" />

templates/module/aspnet-core/host/MyCompanyName.MyProjectName.IdentityServer/MyProjectNameIdentityServerModule.cs

@@ -10,8 +10,8 @@ using Swashbuckle.AspNetCore.Swagger;
 using Volo.Abp;
 using Volo.Abp.Account.Web;
 using Volo.Abp.AspNetCore.Authentication.JwtBearer;
-using Volo.Abp.AspNetCore.MultiTenancy;
 using Volo.Abp.AspNetCore.Mvc;
+using Volo.Abp.AspNetCore.Mvc.UI.MultiTenancy;
 using Volo.Abp.AspNetCore.Mvc.UI.Theme.Basic;
 using Volo.Abp.Auditing;
 using Volo.Abp.AuditLogging.EntityFrameworkCore;
@@ -26,6 +26,7 @@ using Volo.Abp.Identity.EntityFrameworkCore;
 using Volo.Abp.IdentityServer.EntityFrameworkCore;
 using Volo.Abp.Localization;
 using Volo.Abp.Modularity;
+using Volo.Abp.MultiTenancy;
 using Volo.Abp.PermissionManagement;
 using Volo.Abp.PermissionManagement.EntityFrameworkCore;
 using Volo.Abp.PermissionManagement.HttpApi;
@@ -40,7 +41,7 @@ namespace MyCompanyName.MyProjectName
 {
     [DependsOn(
         typeof(AbpAccountWebIdentityServerModule),
-        typeof(AbpAspNetCoreMultiTenancyModule),
+        typeof(AbpAspNetCoreMvcUiMultiTenancyModule),
         typeof(AbpAspNetCoreMvcModule),
         typeof(AbpAspNetCoreMvcUiBasicThemeModule),
         typeof(AbpAuditLoggingEntityFrameworkCoreModule),
@@ -115,6 +116,11 @@ namespace MyCompanyName.MyProjectName
                 options.KeyPrefix = "MyProjectName:";
             });
 
+            Configure<AbpMultiTenancyOptions>(options =>
+            {
+                options.IsEnabled = MultiTenancyConsts.IsEnabled;
+            });
+
             context.Services.AddStackExchangeRedisCache(options =>
             {
                 options.Configuration = configuration["Redis:Configuration"];