try this way

Author: damies13

.github/workflows/Package.yaml

@@ -229,10 +229,10 @@ jobs:
       #       dir ($PWD.Path + "\Packaging\Windows\MSI")
 
       - name: MSI Build
-        # run: wix build -out ($PWD.Path + "\dist\TestDataTable.msi") ($PWD.Path + "\Packaging\Windows\MSI\Package.wxs")
+        run: wix build -out ($PWD.Path + "\dist\TestDataTable.msi") ($PWD.Path + "\Packaging\Windows\MSI\Package.wxs")
         # run: wix build -ext WixUtilExtension -out \dist\TestDataTable.msi \Packaging\Windows\MSI\Package.wxs
         # run: wix build -ext WixToolset.Util.wixext -out \dist\TestDataTable.msi \Packaging\Windows\MSI\Package.wxs
-        run: wix build -ext WixToolset.Util.wixext -out ($PWD.Path + "\dist\TestDataTable.msi") ($PWD.Path + "\Packaging\Windows\MSI\Package.wxs")
+        # run: wix build -ext WixToolset.Util.wixext -out ($PWD.Path + "\dist\TestDataTable.msi") ($PWD.Path + "\Packaging\Windows\MSI\Package.wxs")
         # working-directory: ./Packaging/Windows/MSI
 
       - name: Show Dist

Packaging/Windows/MSI/Package.wxs

@@ -1,4 +1,7 @@
-<Wix xmlns="http://wixtoolset.org/schemas/v4/wxs">
+<Wix
+		xmlns="http://wixtoolset.org/schemas/v4/wxs"
+		xmlns:util="http://wixtoolset.org/schemas/v4/wxs/util"
+		>
 	<Bundle
 			Id="damies13.TestDataTable"
 			Name="TestDataTable"

Packaging/Windows/MSI/TestDataTable.wixproj

@@ -1,2 +1,5 @@
 <Project Sdk="WixToolset.Sdk/6.0.0">
+	<ItemGroup>
+		<PackageReference Include="WixToolset.Util.wixext" Version="6.0.0" />
+	</ItemGroup>
 </Project>