diff --git a/src/MSIdentityScaffolding/Microsoft.DotNet.MSIdentity/ProjectDescription/ProjectDescriptionReader.cs b/src/MSIdentityScaffolding/Microsoft.DotNet.MSIdentity/ProjectDescription/ProjectDescriptionReader.cs
index e19ed0594..c91a3a81d 100644
--- a/src/MSIdentityScaffolding/Microsoft.DotNet.MSIdentity/ProjectDescription/ProjectDescriptionReader.cs
+++ b/src/MSIdentityScaffolding/Microsoft.DotNet.MSIdentity/ProjectDescription/ProjectDescriptionReader.cs
@@ -41,7 +41,7 @@ public ProjectDescriptionReader(IEnumerable<string> files)
             }
 
             // If projectDescription cannot be inferred, default to Web App
-            return ProjectDescriptions.FirstOrDefault(p => string.Equals(ProjectTypes.WebApp, p.Identifier));
+            return ProjectDescriptions.FirstOrDefault(p => string.Equals($"{ProjectTypeIdPrefix}{ProjectTypes.WebApp}", p.Identifier));
         }
 
         static readonly JsonSerializerOptions serializerOptionsWithComments = new JsonSerializerOptions
diff --git a/src/MSIdentityScaffolding/Microsoft.DotNet.MSIdentity/ProjectDescriptions/dotnet_webapp.json b/src/MSIdentityScaffolding/Microsoft.DotNet.MSIdentity/ProjectDescriptions/dotnet_webapp.json
index dccd80e67..0f92e9956 100644
--- a/src/MSIdentityScaffolding/Microsoft.DotNet.MSIdentity/ProjectDescriptions/dotnet_webapp.json
+++ b/src/MSIdentityScaffolding/Microsoft.DotNet.MSIdentity/ProjectDescriptions/dotnet_webapp.json
@@ -3,6 +3,10 @@
   "ProjectRelativeFolder": "",
   "BasedOnProjectDescription": "dotnet-web",
   "MatchesForProjectType": [
+    {
+      "FileRelativePath": "Startup.cs",
+      "MatchAny": [ ".AddAzureAD", ".AddMicrosoftIdentityWebApp", ".AddMicrosoftIdentityWebAppAuthentication", "Microsoft.Owin" ]
+    },
     {
       "FolderRelativePath": "Pages",
       "FileRelativePath": "Index.cshtml",