diff --git a/CHANGELOG.md b/CHANGELOG.md
index 53b0001220..499454d1e3 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -15,6 +15,7 @@ This is the log of notable changes to EAS CLI and related packages.
 
 - [build-tools] Allow expo.test subdomains to open local and staging simulator previews. ([#4480](https://github.com/expo/eas-cli/pull/4480) by [@hirbod](https://github.com/hirbod))
 - [build-tools] Retry App Store Connect connection failures and safely recover interrupted status reads and upload commits. ([#4520](https://github.com/expo/eas-cli/pull/4520) by [@sjchmiela](https://github.com/sjchmiela))
+- [eas-cli] Fail `eas deploy --prod` and `eas deploy:alias` when the alias was not moved to the new deployment, instead of reporting success and exiting 0. ([#4443](https://github.com/expo/eas-cli/pull/4443) by [@LizunovSergey](https://github.com/LizunovSergey))
 
 ### 🧹 Chores
 
diff --git a/packages/eas-cli/src/worker/__tests__/deployment.test.ts b/packages/eas-cli/src/worker/__tests__/deployment.test.ts
index f429741c4a..ab0c548d0e 100644
--- a/packages/eas-cli/src/worker/__tests__/deployment.test.ts
+++ b/packages/eas-cli/src/worker/__tests__/deployment.test.ts
@@ -3,6 +3,8 @@ import { promptAsync } from '../../prompts';
 import {
   assertValidDevDomainName,
   assignDevDomainNameAsync,
+  assignWorkerDeploymentAliasAsync,
+  assignWorkerDeploymentProductionAsync,
   getSignedDeploymentUrlAsync,
 } from '../deployment';
 import { DeploymentsMutation } from '../mutations';
@@ -248,3 +250,105 @@ describe(getSignedDeploymentUrlAsync, () => {
     expect(DeploymentsMutation.assignDevDomainNameAsync).not.toHaveBeenCalled();
   });
 });
+
+function createAliasResult({
+  aliasName,
+  deploymentIdentifier,
+}: {
+  aliasName: string | null;
+  deploymentIdentifier: string;
+}): any {
+  return {
+    id: 'alias-id',
+    aliasName,
+    url: 'https://warp-nexus.expo.app',
+    workerDeployment: {
+      id: 'worker-deployment-id',
+      url: `https://warp-nexus--${deploymentIdentifier}.expo.app`,
+      deploymentIdentifier,
+      deploymentDomain: 'warp-nexus',
+      createdAt: '2026-09-11T00:00:00.000Z',
+    },
+  };
+}
+
+describe(assignWorkerDeploymentProductionAsync, () => {
+  beforeEach(() => {
+    jest.resetAllMocks();
+  });
+
+  it('returns the alias when production was moved to the requested deployment', async () => {
+    const graphqlClient = {} as ExpoGraphqlClient;
+    const alias = createAliasResult({ aliasName: null, deploymentIdentifier: 'y3iw49p3qz' });
+    jest.mocked(DeploymentsMutation.assignAliasAsync).mockResolvedValueOnce(alias);
+
+    await expect(
+      assignWorkerDeploymentProductionAsync({
+        graphqlClient,
+        appId: 'test-app-id',
+        deploymentId: 'y3iw49p3qz',
+      })
+    ).resolves.toBe(alias);
+  });
+
+  it('throws when production still points at the previous deployment', async () => {
+    // Repros expo/eas-cli#4388: the mutation resolves, so the command printed
+    // "Promoted deployment to production" and exited 0 while production kept
+    // serving the previous bundle.
+    const graphqlClient = {} as ExpoGraphqlClient;
+    jest
+      .mocked(DeploymentsMutation.assignAliasAsync)
+      .mockResolvedValueOnce(
+        createAliasResult({ aliasName: null, deploymentIdentifier: 'c0547b2ed2' })
+      );
+
+    await expect(
+      assignWorkerDeploymentProductionAsync({
+        graphqlClient,
+        appId: 'test-app-id',
+        deploymentId: 'y3iw49p3qz',
+      })
+    ).rejects.toThrow(
+      'Production was not moved to deployment "y3iw49p3qz" and still points to "c0547b2ed2".'
+    );
+  });
+});
+
+describe(assignWorkerDeploymentAliasAsync, () => {
+  beforeEach(() => {
+    jest.resetAllMocks();
+  });
+
+  it('returns the alias when it was moved to the requested deployment', async () => {
+    const graphqlClient = {} as ExpoGraphqlClient;
+    const alias = createAliasResult({ aliasName: 'staging', deploymentIdentifier: 'y3iw49p3qz' });
+    jest.mocked(DeploymentsMutation.assignAliasAsync).mockResolvedValueOnce(alias);
+
+    await expect(
+      assignWorkerDeploymentAliasAsync({
+        graphqlClient,
+        appId: 'test-app-id',
+        deploymentId: 'y3iw49p3qz',
+        aliasName: 'staging',
+      })
+    ).resolves.toBe(alias);
+  });
+
+  it('names the alias when it still points at the previous deployment', async () => {
+    const graphqlClient = {} as ExpoGraphqlClient;
+    jest
+      .mocked(DeploymentsMutation.assignAliasAsync)
+      .mockResolvedValueOnce(
+        createAliasResult({ aliasName: 'staging', deploymentIdentifier: 'c0547b2ed2' })
+      );
+
+    await expect(
+      assignWorkerDeploymentAliasAsync({
+        graphqlClient,
+        appId: 'test-app-id',
+        deploymentId: 'y3iw49p3qz',
+        aliasName: 'staging',
+      })
+    ).rejects.toThrow('Alias "staging" was not moved to deployment "y3iw49p3qz"');
+  });
+});
diff --git a/packages/eas-cli/src/worker/deployment.ts b/packages/eas-cli/src/worker/deployment.ts
index 3e8cc86e9b..20fd9529c2 100644
--- a/packages/eas-cli/src/worker/deployment.ts
+++ b/packages/eas-cli/src/worker/deployment.ts
@@ -250,11 +250,13 @@ export async function assignWorkerDeploymentAliasAsync({
   deploymentId: string;
   aliasName: string;
 }): ReturnType<typeof DeploymentsMutation.assignAliasAsync> {
-  return await DeploymentsMutation.assignAliasAsync(graphqlClient, {
+  const alias = await DeploymentsMutation.assignAliasAsync(graphqlClient, {
     appId,
     deploymentId,
     aliasName,
   });
+  assertAliasPointsToDeployment(alias, deploymentId);
+  return alias;
 }
 
 export async function assignWorkerDeploymentProductionAsync({
@@ -266,11 +268,36 @@ export async function assignWorkerDeploymentProductionAsync({
   appId: string;
   deploymentId: string;
 }): ReturnType<typeof DeploymentsMutation.assignAliasAsync> {
-  return await DeploymentsMutation.assignAliasAsync(graphqlClient, {
+  const alias = await DeploymentsMutation.assignAliasAsync(graphqlClient, {
     appId,
     deploymentId,
     aliasName: null, // this will assign the deployment as production
   });
+  assertAliasPointsToDeployment(alias, deploymentId);
+  return alias;
+}
+
+/**
+ * The mutation resolves with the alias as it now stands, which is not necessarily the deployment
+ * that was requested. Without this check the caller reports success and exits 0 while the alias
+ * still resolves to the previous deployment, which is what expo/eas-cli#4388 describes for
+ * `--prod`. `assignDevDomainNameAsync` already compares its own mutation's result against what it
+ * asked for; this does the same for aliases.
+ */
+function assertAliasPointsToDeployment(
+  alias: Awaited<ReturnType<typeof DeploymentsMutation.assignAliasAsync>>,
+  requestedDeploymentId: string
+): void {
+  const assignedDeploymentId = alias.workerDeployment.deploymentIdentifier;
+  if (String(assignedDeploymentId) === String(requestedDeploymentId)) {
+    return;
+  }
+  const target = alias.aliasName ? `Alias "${alias.aliasName}"` : 'Production';
+  throw new Error(
+    `${target} was not moved to deployment "${requestedDeploymentId}" and still points to ` +
+      `"${assignedDeploymentId}". The deployment itself was created and is reachable at its own ` +
+      `URL, so retrying the command is safe.`
+  );
 }
 
 export async function selectWorkerDeploymentOnAppAsync({