diff --git a/js/app.js b/js/app.js
index 211150f2..f33c9653 100644
--- a/js/app.js
+++ b/js/app.js
@@ -6749,10 +6749,19 @@ class bitvidApp {
       this.resetViewLoggingState();
     }
 
+    const trimmedPubkey =
+      typeof pubkey === "string" && pubkey.trim() ? pubkey.trim() : "";
+
     if (normalizedPubkey) {
       this.pubkey = normalizedPubkey;
+      if (nostrClient && typeof nostrClient === "object") {
+        nostrClient.pubkey = normalizedPubkey;
+      }
     } else {
       this.pubkey = pubkey;
+      if (nostrClient && typeof nostrClient === "object") {
+        nostrClient.pubkey = trimmedPubkey ? trimmedPubkey.toLowerCase() : "";
+      }
     }
     this.currentUserNpub = this.safeEncodeNpub(this.pubkey);
 
@@ -7587,8 +7596,52 @@ class bitvidApp {
         try {
           const canUseWatchHistoryService =
             typeof watchHistoryService?.publishView === "function";
+          const resolveWatchActor = () => {
+            const normalizedUser = this.normalizeHexPubkey(this.pubkey);
+            if (normalizedUser) {
+              return normalizedUser;
+            }
+
+            const normalizedClient = this.normalizeHexPubkey(
+              nostrClient?.pubkey
+            );
+            if (normalizedClient) {
+              return normalizedClient;
+            }
+
+            const normalizedSession = this.normalizeHexPubkey(
+              nostrClient?.sessionActor?.pubkey
+            );
+            if (normalizedSession) {
+              return normalizedSession;
+            }
+
+            if (
+              typeof nostrClient?.pubkey === "string" &&
+              nostrClient.pubkey.trim()
+            ) {
+              return nostrClient.pubkey.trim().toLowerCase();
+            }
+
+            if (
+              typeof nostrClient?.sessionActor?.pubkey === "string" &&
+              nostrClient.sessionActor.pubkey.trim()
+            ) {
+              return nostrClient.sessionActor.pubkey.trim().toLowerCase();
+            }
+
+            return "";
+          };
+
+          const activeWatchActor = resolveWatchActor();
+          const watchMetadata = activeWatchActor ? { actor: activeWatchActor } : undefined;
+
           if (canUseWatchHistoryService) {
-            viewResult = await watchHistoryService.publishView(thresholdPointer);
+            viewResult = await watchHistoryService.publishView(
+              thresholdPointer,
+              undefined,
+              watchMetadata
+            );
           } else if (typeof nostrClient?.recordVideoView === "function") {
             viewResult = await nostrClient.recordVideoView(thresholdPointer);
           } else {
@@ -11640,5 +11693,11 @@ function dedupeToNewestByRoot(videos) {
 
 export const app = new bitvidApp();
 export const appReady = app.init();
-window.app = app;
-window.appReady = appReady;
+
+if (typeof window !== "undefined") {
+  window.app = app;
+  window.appReady = appReady;
+  window.bitvid = window.bitvid || {};
+  window.bitvid.app = app;
+  window.bitvid.appReady = appReady;
+}
diff --git a/js/watchHistoryService.js b/js/watchHistoryService.js
index 6e0ca51c..94002c05 100644
--- a/js/watchHistoryService.js
+++ b/js/watchHistoryService.js
@@ -53,7 +53,43 @@ function resolveFlagEnabled() {
 }
 
 function getLoggedInActorKey() {
-  return normalizeActorKey(nostrClient?.pubkey);
+  const direct = normalizeActorKey(nostrClient?.pubkey);
+  if (direct) {
+    return direct;
+  }
+
+  if (typeof window !== "undefined") {
+    const appCandidate =
+      (window.bitvid && window.bitvid.app) || window.app || null;
+    if (appCandidate && typeof appCandidate === "object") {
+      if (typeof appCandidate.normalizeHexPubkey === "function") {
+        try {
+          const normalized = appCandidate.normalizeHexPubkey(
+            appCandidate.pubkey
+          );
+          if (normalized) {
+            return normalizeActorKey(normalized);
+          }
+        } catch (error) {
+          if (isDevMode) {
+            console.warn(
+              "[watchHistoryService] Failed to normalize app login pubkey:",
+              error
+            );
+          }
+        }
+      }
+
+      if (typeof appCandidate.pubkey === "string" && appCandidate.pubkey) {
+        const fallback = normalizeActorKey(appCandidate.pubkey);
+        if (fallback) {
+          return fallback;
+        }
+      }
+    }
+  }
+
+  return "";
 }
 
 function getSessionActorKey() {
diff --git a/tests/watch-history.test.mjs b/tests/watch-history.test.mjs
index d8bff039..b9fae06a 100644
--- a/tests/watch-history.test.mjs
+++ b/tests/watch-history.test.mjs
@@ -1148,6 +1148,52 @@ async function testWatchHistorySyncEnabledForLoggedInUsers() {
   }
 }
 
+async function testWatchHistoryAppLoginFallback() {
+  console.log("Running watch history app login fallback test...");
+
+  const actor = "f".repeat(64);
+  const originalPub = nostrClient.pubkey;
+  const originalSession = nostrClient.sessionActor;
+  const originalApp = typeof window.app === "undefined" ? undefined : window.app;
+
+  try {
+    setWatchHistoryV2Enabled(false);
+    localStorage.clear();
+    watchHistoryService.resetProgress();
+    nostrClient.pubkey = "";
+    nostrClient.sessionActor = null;
+    window.app = {
+      pubkey: actor,
+      normalizeHexPubkey(value) {
+        if (typeof value === "string" && value.trim()) {
+          return value.trim().toLowerCase();
+        }
+        return null;
+      },
+    };
+
+    const enabled =
+      typeof watchHistoryService.isEnabled === "function"
+        ? watchHistoryService.isEnabled(actor)
+        : false;
+    assert.equal(
+      enabled,
+      true,
+      "sync should be enabled when the app reports a logged-in pubkey",
+    );
+  } finally {
+    setWatchHistoryV2Enabled(true);
+    watchHistoryService.resetProgress();
+    nostrClient.pubkey = originalPub;
+    nostrClient.sessionActor = originalSession;
+    if (typeof originalApp === "undefined") {
+      delete window.app;
+    } else {
+      window.app = originalApp;
+    }
+  }
+}
+
 await testPublishSnapshotCanonicalizationAndChunking();
 await testPublishSnapshotUsesExtensionCrypto();
 await testPublishSnapshotFailureRetry();
@@ -1156,6 +1202,7 @@ await testResolveWatchHistoryBatchingWindow();
 await testWatchHistoryServiceIntegration();
 await testWatchHistoryLocalFallbackWhenDisabled();
 await testWatchHistorySyncEnabledForLoggedInUsers();
+await testWatchHistoryAppLoginFallback();
 
 console.log("watch-history.test.mjs completed successfully");