diff --git a/clients/src/main/java/org/apache/kafka/clients/consumer/internals/ShareConsumeRequestManager.java b/clients/src/main/java/org/apache/kafka/clients/consumer/internals/ShareConsumeRequestManager.java
index e016d0d3984..51e3fb39dfb 100644
--- a/clients/src/main/java/org/apache/kafka/clients/consumer/internals/ShareConsumeRequestManager.java
+++ b/clients/src/main/java/org/apache/kafka/clients/consumer/internals/ShareConsumeRequestManager.java
@@ -758,6 +758,16 @@ public class ShareConsumeRequestManager implements RequestManager, MemberStateLi
                 if (response.error() == Errors.UNKNOWN_TOPIC_ID) {
                     metadata.requestUpdate(false);
                 }
+                // Complete any inFlight acknowledgements with the error code from the response.
+                Map<TopicIdPartition, Acknowledgements> nodeAcknowledgementsInFlight = fetchAcknowledgementsInFlight.get(fetchTarget.id());
+                if (nodeAcknowledgementsInFlight != null) {
+                    nodeAcknowledgementsInFlight.forEach((tip, acks) -> {
+                        acks.complete(Errors.forCode(response.error().code()).exception());
+                        metricsManager.recordFailedAcknowledgements(acks.size());
+                    });
+                    maybeSendShareAcknowledgeCommitCallbackEvent(nodeAcknowledgementsInFlight);
+                    nodeAcknowledgementsInFlight.clear();
+                }
                 return;
             }
 
diff --git a/clients/src/test/java/org/apache/kafka/clients/consumer/internals/ShareConsumeRequestManagerTest.java b/clients/src/test/java/org/apache/kafka/clients/consumer/internals/ShareConsumeRequestManagerTest.java
index 57407260dee..68da71d7767 100644
--- a/clients/src/test/java/org/apache/kafka/clients/consumer/internals/ShareConsumeRequestManagerTest.java
+++ b/clients/src/test/java/org/apache/kafka/clients/consumer/internals/ShareConsumeRequestManagerTest.java
@@ -1455,6 +1455,39 @@ public class ShareConsumeRequestManagerTest {
         assertEquals(Errors.INVALID_SHARE_SESSION_EPOCH.exception(), completedAcknowledgements.get(0).get(tip0).getAcknowledgeException());
     }
 
+    @Test
+    public void testPiggybackAcknowledgementsOnInitialShareSession_ShareSessionNotFound() {
+        buildRequestManager();
+        shareConsumeRequestManager.setAcknowledgementCommitCallbackRegistered(true);
+
+        assignFromSubscribed(singleton(tp0));
+        sendFetchAndVerifyResponse(records, acquiredRecords, Errors.NONE);
+
+        fetchRecords();
+
+        // The acknowledgements for the initial fetch from tip0 are processed now and sent to the background thread.
+        Acknowledgements acknowledgements = getAcknowledgements(1, AcknowledgeType.ACCEPT, AcknowledgeType.ACCEPT, AcknowledgeType.REJECT);
+        shareConsumeRequestManager.fetch(Map.of(tip0, new NodeAcknowledgements(0, acknowledgements)), Collections.emptyMap());
+
+        // We attempt to send the acknowledgements piggybacking on the fetch.
+        assertEquals(1, sendFetches());
+        assertFalse(shareConsumeRequestManager.hasCompletedFetches());
+
+        // Simulate a broker restart, but no leader change, this resets share session epoch to 0.
+        client.prepareResponse(fetchResponseWithTopLevelError(tip0, Errors.SHARE_SESSION_NOT_FOUND));
+        networkClientDelegate.poll(time.timer(0));
+
+        // We would complete these acknowledgements with the error code from the response.
+        assertEquals(3, completedAcknowledgements.get(0).get(tip0).size());
+        assertEquals(Errors.SHARE_SESSION_NOT_FOUND.exception(), completedAcknowledgements.get(0).get(tip0).getAcknowledgeException());
+
+        // Next fetch would proceed as expected and would not include any acknowledgements.
+        NetworkClientDelegate.PollResult pollResult = shareConsumeRequestManager.sendFetchesReturnPollResult();
+        assertEquals(1, pollResult.unsentRequests.size());
+        ShareFetchRequest.Builder builder = (ShareFetchRequest.Builder) pollResult.unsentRequests.get(0).requestBuilder();
+        assertEquals(0, builder.data().topics().find(topicId).partitions().find(0).acknowledgementBatches().size());
+    }
+
     @Test
     public void testInvalidDefaultRecordBatch() {
         buildRequestManager();