diff --git a/components/brave_rewards/browser/rewards_notification_service.cc b/components/brave_rewards/browser/rewards_notification_service.cc
index 16a0f1fb6d5..3cecd1c937f 100644
--- a/components/brave_rewards/browser/rewards_notification_service.cc
+++ b/components/brave_rewards/browser/rewards_notification_service.cc
@@ -29,6 +29,12 @@ RewardsNotificationService::RewardsNotification::~RewardsNotification() {}
 
 void RewardsNotificationService::AddObserver(
     RewardsNotificationServiceObserver* observer) {
+  // Send any pending notifications immediately.
+  RewardsNotificationsMap notifications = GetAllNotifications();
+  for (auto& notification : notifications) {
+    observer->OnNotificationAdded(this, notification.second);
+  }
+
   observers_.AddObserver(observer);
 }
 
diff --git a/components/brave_rewards/browser/rewards_notification_service.h b/components/brave_rewards/browser/rewards_notification_service.h
index f16b4e92292..3c882fd52f3 100644
--- a/components/brave_rewards/browser/rewards_notification_service.h
+++ b/components/brave_rewards/browser/rewards_notification_service.h
@@ -48,6 +48,8 @@ class RewardsNotificationService {
   };
 
   typedef std::vector<RewardsNotification> RewardsNotificationsList;
+  typedef std::map<RewardsNotificationID, RewardsNotification>
+      RewardsNotificationsMap;
 
   virtual void AddNotification(RewardsNotificationType type,
                                RewardsNotificationArgs args,
@@ -56,8 +58,8 @@ class RewardsNotificationService {
   virtual void DeleteNotification(RewardsNotificationID id) = 0;
   virtual void DeleteAllNotifications() = 0;
   virtual void GetNotification(RewardsNotificationID id) = 0;
-  virtual void GetAllNotifications() = 0;
-
+  virtual void GetNotifications() = 0;
+  virtual const RewardsNotificationsMap& GetAllNotifications() const = 0;
   virtual void ReadRewardsNotificationsJSON() = 0;
   virtual void StoreRewardsNotifications() = 0;
 
diff --git a/components/brave_rewards/browser/rewards_notification_service_impl.cc b/components/brave_rewards/browser/rewards_notification_service_impl.cc
index 70ed56c3b3c..f1c32e41ca4 100644
--- a/components/brave_rewards/browser/rewards_notification_service_impl.cc
+++ b/components/brave_rewards/browser/rewards_notification_service_impl.cc
@@ -102,7 +102,7 @@ void RewardsNotificationServiceImpl::GetNotification(RewardsNotificationID id) {
   OnGetNotification(rewards_notifications_[id]);
 }
 
-void RewardsNotificationServiceImpl::GetAllNotifications() {
+void RewardsNotificationServiceImpl::GetNotifications() {
   RewardsNotificationsList rewards_notifications_list;
   for (auto& item : rewards_notifications_) {
     rewards_notifications_list.push_back(item.second);
@@ -110,6 +110,11 @@ void RewardsNotificationServiceImpl::GetAllNotifications() {
   OnGetAllNotifications(rewards_notifications_list);
 }
 
+const RewardsNotificationService::RewardsNotificationsMap&
+RewardsNotificationServiceImpl::GetAllNotifications() const {
+  return rewards_notifications_;
+}
+
 RewardsNotificationServiceImpl::RewardsNotificationID
 RewardsNotificationServiceImpl::GenerateRewardsNotificationID() const {
   return base::StringPrintf(
diff --git a/components/brave_rewards/browser/rewards_notification_service_impl.h b/components/brave_rewards/browser/rewards_notification_service_impl.h
index f4f4290c8f7..8eaaa222771 100644
--- a/components/brave_rewards/browser/rewards_notification_service_impl.h
+++ b/components/brave_rewards/browser/rewards_notification_service_impl.h
@@ -34,7 +34,8 @@ class RewardsNotificationServiceImpl
   void DeleteNotification(RewardsNotificationID id) override;
   void DeleteAllNotifications() override;
   void GetNotification(RewardsNotificationID id) override;
-  void GetAllNotifications() override;
+  void GetNotifications() override;
+  const RewardsNotificationsMap& GetAllNotifications() const override;
 
   void ReadRewardsNotificationsJSON() override;
   void ReadRewardsNotifications(std::unique_ptr<base::ListValue>);
@@ -75,7 +76,7 @@ class RewardsNotificationServiceImpl
   RewardsNotificationTimestamp GenerateRewardsNotificationTimestamp() const;
 
   Profile* profile_;
-  std::map<RewardsNotificationID, RewardsNotification> rewards_notifications_;
+  RewardsNotificationsMap rewards_notifications_;
   std::vector<RewardsNotificationID> rewards_notifications_displayed_;
 #if BUILDFLAG(ENABLE_EXTENSIONS)
   std::unique_ptr<ExtensionRewardsNotificationServiceObserver>