diff --git a/transforms/csdl/preprocess_csdl.xsl b/transforms/csdl/preprocess_csdl.xsl
index 159e84aeb..ddc6cfe9d 100644
--- a/transforms/csdl/preprocess_csdl.xsl
+++ b/transforms/csdl/preprocess_csdl.xsl
@@ -171,6 +171,30 @@
         </xsl:copy>
     </xsl:template>
 
+    <!-- Add Acceptable Media Types -->
+    <xsl:template match="edm:Schema[@Namespace='microsoft.graph']/edm:EntityType[@Name='organizationalBrandingProperties']/edm:Property[@Name='backgroundImage']|
+                         edm:Schema[@Namespace='microsoft.graph']/edm:EntityType[@Name='organizationalBrandingProperties']/edm:Property[@Name='bannerLogo']|
+                         edm:Schema[@Namespace='microsoft.graph']/edm:EntityType[@Name='organizationalBrandingProperties']/edm:Property[@Name='customCSS']|
+                         edm:Schema[@Namespace='microsoft.graph']/edm:EntityType[@Name='organizationalBrandingProperties']/edm:Property[@Name='favicon']|
+                         edm:Schema[@Namespace='microsoft.graph']/edm:EntityType[@Name='organizationalBrandingProperties']/edm:Property[@Name='headerLogo']|
+                         edm:Schema[@Namespace='microsoft.graph']/edm:EntityType[@Name='organizationalBrandingProperties']/edm:Property[@Name='squareLogo']|
+                         edm:Schema[@Namespace='microsoft.graph']/edm:EntityType[@Name='organizationalBrandingProperties']/edm:Property[@Name='squareLogoDark']">
+        <xsl:copy>
+            <xsl:copy-of select="@* | node()" />
+            <Annotation Term="Org.OData.Core.V1.AcceptableMediaTypes">
+                <Collection>
+                    <String>image/bmp</String>
+                    <String>image/jpg</String>
+	                <String>image/jpeg</String>
+                    <String>image/gif</String>
+	                <String>image/vnd.microsoft.icon</String>
+                    <String>image/png</String>
+                    <String>image/tiff</String>
+                </Collection>
+            </Annotation>            
+        </xsl:copy>
+    </xsl:template>
+    
     <!-- Add odata cast annotation -->
     <xsl:template match="edm:Schema[@Namespace='microsoft.graph']/edm:EntityType[@Name='group']/edm:NavigationProperty[@Name='members']|
                          edm:Schema[@Namespace='microsoft.graph']/edm:EntityType[@Name='group']/edm:NavigationProperty[@Name='membersWithLicenseErrors']|
diff --git a/transforms/csdl/preprocess_csdl_test_input.xml b/transforms/csdl/preprocess_csdl_test_input.xml
index ddaeb949c..9ce26291f 100644
--- a/transforms/csdl/preprocess_csdl_test_input.xml
+++ b/transforms/csdl/preprocess_csdl_test_input.xml
@@ -89,6 +89,15 @@
             <EntityType Name="rbacApplication" BaseType="graph.entity">                
                 <NavigationProperty Name="transitiveRoleAssignments" Type="Collection(graph.unifiedRoleAssignment)" ContainsTarget="true" />                
             </EntityType>
+            <EntityType Name="organizationalBrandingProperties" BaseType="graph.entity" Abstract="true">
+                <Property Name="backgroundImage" Type="Edm.Stream" />
+                <Property Name="bannerLogo" Type="Edm.Stream" />
+                <Property Name="customCSS" Type="Edm.Stream" />
+                <Property Name="favicon" Type="Edm.Stream" />
+                <Property Name="headerLogo" Type="Edm.Stream" />
+                <Property Name="squareLogo" Type="Edm.Stream" />
+                <Property Name="squareLogoDark" Type="Edm.Stream" />
+            </EntityType>            
             <EntityType Name="externalUsersSelfServiceSignUpEventsFlow" BaseType="graph.authenticationEventsFlow">
                 <Property Name="onAttributeCollection" Type="graph.onAttributeCollectionHandler" />
                 <Property Name="onAuthenticationMethodLoadStart" Type="graph.onAuthenticationMethodLoadStartHandler" />
diff --git a/transforms/csdl/preprocess_csdl_test_output.xml b/transforms/csdl/preprocess_csdl_test_output.xml
index fa27eed1a..4e5aeb5a7 100644
--- a/transforms/csdl/preprocess_csdl_test_output.xml
+++ b/transforms/csdl/preprocess_csdl_test_output.xml
@@ -1,4 +1,4 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?>
 <?xml-stylesheet type='text/xsl' href='preprocess_csdl.xsl'?>
 <edmx:Edmx Version="4.0" xmlns:edmx="http://docs.oasis-open.org/odata/ns/edmx">
   <edmx:DataServices>
@@ -404,6 +404,99 @@
           </Annotation>
         </NavigationProperty>
       </EntityType>
+      <EntityType Name="organizationalBrandingProperties" BaseType="graph.entity" Abstract="true">
+        <Property Name="backgroundImage" Type="Edm.Stream">
+          <Annotation Term="Org.OData.Core.V1.AcceptableMediaTypes" xmlns:edm="http://docs.oasis-open.org/odata/ns/edm">
+            <Collection>
+              <String>image/bmp</String>
+              <String>image/jpg</String>
+              <String>image/jpeg</String>
+              <String>image/gif</String>
+              <String>image/vnd.microsoft.icon</String>
+              <String>image/png</String>
+              <String>image/tiff</String>
+            </Collection>
+          </Annotation>
+        </Property>
+        <Property Name="bannerLogo" Type="Edm.Stream">
+          <Annotation Term="Org.OData.Core.V1.AcceptableMediaTypes" xmlns:edm="http://docs.oasis-open.org/odata/ns/edm">
+            <Collection>
+              <String>image/bmp</String>
+              <String>image/jpg</String>
+              <String>image/jpeg</String>
+              <String>image/gif</String>
+              <String>image/vnd.microsoft.icon</String>
+              <String>image/png</String>
+              <String>image/tiff</String>
+            </Collection>
+          </Annotation>
+        </Property>
+        <Property Name="customCSS" Type="Edm.Stream">
+          <Annotation Term="Org.OData.Core.V1.AcceptableMediaTypes" xmlns:edm="http://docs.oasis-open.org/odata/ns/edm">
+            <Collection>
+              <String>image/bmp</String>
+              <String>image/jpg</String>
+              <String>image/jpeg</String>
+              <String>image/gif</String>
+              <String>image/vnd.microsoft.icon</String>
+              <String>image/png</String>
+              <String>image/tiff</String>
+            </Collection>
+          </Annotation>
+        </Property>
+        <Property Name="favicon" Type="Edm.Stream">
+          <Annotation Term="Org.OData.Core.V1.AcceptableMediaTypes" xmlns:edm="http://docs.oasis-open.org/odata/ns/edm">
+            <Collection>
+              <String>image/bmp</String>
+              <String>image/jpg</String>
+              <String>image/jpeg</String>
+              <String>image/gif</String>
+              <String>image/vnd.microsoft.icon</String>
+              <String>image/png</String>
+              <String>image/tiff</String>
+            </Collection>
+          </Annotation>
+        </Property>
+        <Property Name="headerLogo" Type="Edm.Stream">
+          <Annotation Term="Org.OData.Core.V1.AcceptableMediaTypes" xmlns:edm="http://docs.oasis-open.org/odata/ns/edm">
+            <Collection>
+              <String>image/bmp</String>
+              <String>image/jpg</String>
+              <String>image/jpeg</String>
+              <String>image/gif</String>
+              <String>image/vnd.microsoft.icon</String>
+              <String>image/png</String>
+              <String>image/tiff</String>
+            </Collection>
+          </Annotation>
+        </Property>
+        <Property Name="squareLogo" Type="Edm.Stream">
+          <Annotation Term="Org.OData.Core.V1.AcceptableMediaTypes" xmlns:edm="http://docs.oasis-open.org/odata/ns/edm">
+            <Collection>
+              <String>image/bmp</String>
+              <String>image/jpg</String>
+              <String>image/jpeg</String>
+              <String>image/gif</String>
+              <String>image/vnd.microsoft.icon</String>
+              <String>image/png</String>
+              <String>image/tiff</String>
+            </Collection>
+          </Annotation>
+        </Property>
+        <Property Name="squareLogoDark" Type="Edm.Stream">
+          <Annotation Term="Org.OData.Core.V1.AcceptableMediaTypes" xmlns:edm="http://docs.oasis-open.org/odata/ns/edm">
+            <Collection>
+              <String>image/bmp</String>
+              <String>image/jpg</String>
+              <String>image/jpeg</String>
+              <String>image/gif</String>
+              <String>image/vnd.microsoft.icon</String>
+              <String>image/png</String>
+              <String>image/tiff</String>
+            </Collection>
+          </Annotation>
+        </Property>
+      </EntityType>
       <EntityType Name="externalUsersSelfServiceSignUpEventsFlow" BaseType="graph.authenticationEventsFlow">
         <Property Name="onAttributeCollection" Type="graph.onAttributeCollectionHandler">
           <Annotation Term="Org.OData.Validation.V1.DerivedTypeConstraint" xmlns:edm="http://docs.oasis-open.org/odata/ns/edm">