diff --git a/src/a365/hosting/turnContextUtils.ts b/src/a365/hosting/turnContextUtils.ts
index b4f847e..f2557a1 100644
--- a/src/a365/hosting/turnContextUtils.ts
+++ b/src/a365/hosting/turnContextUtils.ts
@@ -25,7 +25,7 @@ export function getCallerBaggagePairs(turnContext: TurnContextLike): Array<[stri
   }
   const from = turnContext.activity.from;
   const pairs: Array<[string, string | undefined]> = [
-    [OpenTelemetryConstants.USER_ID_KEY, from.aadObjectId || from.agenticUserId || from.id],
+    [OpenTelemetryConstants.USER_ID_KEY, from.aadObjectId],
     [OpenTelemetryConstants.USER_NAME_KEY, from.name],
     [OpenTelemetryConstants.USER_EMAIL_KEY, from.agenticUserId],
     [OpenTelemetryConstants.GEN_AI_CALLER_AGENT_APPLICATION_ID_KEY, from.agenticAppBlueprintId],
diff --git a/src/a365/hosting/types.ts b/src/a365/hosting/types.ts
index eb4b93f..b7c3791 100644
--- a/src/a365/hosting/types.ts
+++ b/src/a365/hosting/types.ts
@@ -21,7 +21,6 @@ export interface ActivityLike {
   channelData?: unknown;
   serviceUrl?: string;
   from?: {
-    id?: string;
     aadObjectId?: string;
     name?: string;
     role?: string;
diff --git a/test/internal/unit/a365/hosting/turnContextUtils.test.ts b/test/internal/unit/a365/hosting/turnContextUtils.test.ts
index 7490d4c..5cc5454 100644
--- a/test/internal/unit/a365/hosting/turnContextUtils.test.ts
+++ b/test/internal/unit/a365/hosting/turnContextUtils.test.ts
@@ -82,64 +82,6 @@ describe("TurnContextUtils", () => {
       expect(pairs).toEqual([]);
     });
 
-    it("should fall back to from.id when aadObjectId is undefined (non-Teams channel)", () => {
-      const ctx: TurnContextLike = {
-        activity: {
-          from: { id: "webchat-user-123", name: "Web User" },
-        },
-        turnState: new Map(),
-      };
-      const pairs = getCallerBaggagePairs(ctx);
-      const obj = Object.fromEntries(pairs);
-      expect(obj[OpenTelemetryConstants.USER_ID_KEY]).toBe("webchat-user-123");
-      expect(obj[OpenTelemetryConstants.USER_NAME_KEY]).toBe("Web User");
-    });
-
-    it("should fall back to agenticUserId when aadObjectId is undefined (A2A)", () => {
-      const ctx: TurnContextLike = {
-        activity: {
-          from: { agenticUserId: "agent@contoso.com", name: "Upstream Agent" },
-        },
-        turnState: new Map(),
-      };
-      const pairs = getCallerBaggagePairs(ctx);
-      const obj = Object.fromEntries(pairs);
-      expect(obj[OpenTelemetryConstants.USER_ID_KEY]).toBe("agent@contoso.com");
-    });
-
-    it("should resolve userId to agenticUserId when it is a GUID (A2A with GUID)", () => {
-      const ctx: TurnContextLike = {
-        activity: {
-          from: {
-            id: "29:1sH5NArUwkWAX",
-            agenticUserId: "bef730f4-d6f5-4ffb-b759-26ffa449ed7e",
-            name: "Agent",
-          },
-        },
-        turnState: new Map(),
-      };
-      const pairs = getCallerBaggagePairs(ctx);
-      const obj = Object.fromEntries(pairs);
-      expect(obj[OpenTelemetryConstants.USER_ID_KEY]).toBe("bef730f4-d6f5-4ffb-b759-26ffa449ed7e");
-    });
-
-    it("should prefer aadObjectId over agenticUserId and from.id", () => {
-      const ctx: TurnContextLike = {
-        activity: {
-          from: {
-            id: "fallback-id",
-            aadObjectId: "aad-oid",
-            agenticUserId: "agent@contoso.com",
-            name: "User",
-          },
-        },
-        turnState: new Map(),
-      };
-      const pairs = getCallerBaggagePairs(ctx);
-      const obj = Object.fromEntries(pairs);
-      expect(obj[OpenTelemetryConstants.USER_ID_KEY]).toBe("aad-oid");
-    });
-
     it("should filter out undefined/empty values", () => {
       const ctx: TurnContextLike = {
         activity: { from: { name: "User", aadObjectId: "" } },