diff --git a/extension/src/test/outdatedCliSuppressionStore.test.ts b/extension/src/test/outdatedCliSuppressionStore.test.ts
index b1c0dfbb88a..1d4d2b79ff1 100644
--- a/extension/src/test/outdatedCliSuppressionStore.test.ts
+++ b/extension/src/test/outdatedCliSuppressionStore.test.ts
@@ -3,7 +3,11 @@ import { spawn } from 'child_process';
 import * as fs from 'fs';
 import * as os from 'os';
 import * as path from 'path';
-import { FileSystemOutdatedCliSuppressionStore } from '../utils/outdatedCliSuppressionStore';
+import * as sinon from 'sinon';
+import {
+    FileSystemOutdatedCliSuppressionStore,
+    OutdatedCliNotificationClaim,
+} from '../utils/outdatedCliSuppressionStore';
 
 suite('outdatedCliSuppressionStore', () => {
     let directory: string;
@@ -30,6 +34,31 @@ suite('outdatedCliSuppressionStore', () => {
             ['/cli/a\u000013.5.0', '/cli/b\u000013.5.0']);
     });
 
+    test('uses one timestamp for a claim marker and payload', async () => {
+        const nowStub = sinon.stub(Date, 'now');
+        nowStub.onFirstCall().returns(1_000);
+        nowStub.returns(1_001);
+        const first = new FileSystemOutdatedCliSuppressionStore(directory);
+        const second = new FileSystemOutdatedCliSuppressionStore(directory);
+        let claim: OutdatedCliNotificationClaim | undefined;
+
+        try {
+            claim = await first.tryClaimNotification('/cli/a\u000013.5.0');
+            assert.ok(claim);
+            const storageDirectory = path.join(directory, 'outdated-cli-suppressions');
+            const claimMarker = fs.readdirSync(storageDirectory)
+                .find(entry => entry.startsWith('notification-claim-'));
+            assert.ok(claimMarker?.startsWith('notification-claim-1000-'));
+
+            await second.add('/cli/b\u000013.5.0');
+            assert.deepStrictEqual(await second.readAll(), ['/cli/b\u000013.5.0']);
+        }
+        finally {
+            await claim?.release();
+            nowStub.restore();
+        }
+    });
+
     test('serializes a suppression written after the final notification check', async () => {
         const first = new FileSystemOutdatedCliSuppressionStore(directory);
         const second = new FileSystemOutdatedCliSuppressionStore(directory);
diff --git a/extension/src/utils/outdatedCliSuppressionStore.ts b/extension/src/utils/outdatedCliSuppressionStore.ts
index d1ade9071a3..8ddeeda57f7 100644
--- a/extension/src/utils/outdatedCliSuppressionStore.ts
+++ b/extension/src/utils/outdatedCliSuppressionStore.ts
@@ -56,7 +56,7 @@ export class FileSystemOutdatedCliSuppressionStore implements OutdatedCliSuppres
             notificationKey,
             processId: process.pid,
             createdAt,
-        });
+        }, createdAt);
         let released = false;
         const claim: OutdatedCliNotificationClaim = {
             isValid: () => isLeaseCurrent(createdAt),
@@ -178,9 +178,13 @@ export class FileSystemOutdatedCliSuppressionStore implements OutdatedCliSuppres
         }
     }
 
-    private async _publishMarker(prefix: string, value: unknown): Promise<string> {
+    private async _publishMarker(
+        prefix: string,
+        value: unknown,
+        createdAt = Date.now(),
+    ): Promise<string> {
         await mkdir(this._directoryPath, { recursive: true });
-        const generation = `${Date.now()}-${process.pid}-${markerSequence++}`;
+        const generation = `${createdAt}-${process.pid}-${markerSequence++}`;
         const fileName = `${prefix}${generation}${markerFileSuffix}`;
         const temporaryPath = path.join(this._directoryPath, `.${fileName}.tmp`);
         const finalPath = path.join(this._directoryPath, fileName);