diff --git a/extensions/msteams/src/policy.test.ts b/extensions/msteams/src/policy.test.ts
index 90ee1f3cd24..3c7daa58b3f 100644
--- a/extensions/msteams/src/policy.test.ts
+++ b/extensions/msteams/src/policy.test.ts
@@ -184,7 +184,7 @@ describe("msteams policy", () => {
       ).toBe(true);
     });
 
-    it("allows allowlist when sender name matches", () => {
+    it("blocks sender-name allowlist matches by default", () => {
       expect(
         isMSTeamsGroupAllowed({
           groupPolicy: "allowlist",
@@ -192,6 +192,18 @@ describe("msteams policy", () => {
           senderId: "other",
           senderName: "User",
         }),
+      ).toBe(false);
+    });
+
+    it("allows sender-name allowlist matches when explicitly enabled", () => {
+      expect(
+        isMSTeamsGroupAllowed({
+          groupPolicy: "allowlist",
+          allowFrom: ["user"],
+          senderId: "other",
+          senderName: "User",
+          allowNameMatching: true,
+        }),
       ).toBe(true);
     });