diff --git a/packages/client-sdk-nodejs/test/integration/integration-setup.ts b/packages/client-sdk-nodejs/test/integration/integration-setup.ts
index d275d7514..8990413d8 100644
--- a/packages/client-sdk-nodejs/test/integration/integration-setup.ts
+++ b/packages/client-sdk-nodejs/test/integration/integration-setup.ts
@@ -393,7 +393,7 @@ export function SetupLeaderboardIntegrationTest(): {
 
 export function SetupAuthClientIntegrationTest(): {
   mgaAccountSessionTokenAuthClient: AuthClient;
-  legacyTokenAuthClient: AuthClient;
+  legacyTokenAuthClient: AuthClient | undefined;
   mgaAccountSessionTokenCacheClient: CacheClient;
   mgaAccountSessionTokenTopicClient: TopicClient;
   authTokenAuthClientFactory: (authToken: string) => AuthClient;
@@ -426,11 +426,13 @@ export function SetupAuthClientIntegrationTest(): {
     mgaAccountSessionTokenAuthClient: new AuthClient({
       credentialProvider: mgaAccountSessionTokenCredsProvider(),
     }),
-    legacyTokenAuthClient: new AuthClient({
-      credentialProvider: CredentialProvider.fromEnvironmentVariable({
-        environmentVariableName: 'TEST_LEGACY_AUTH_TOKEN',
-      }),
-    }),
+    legacyTokenAuthClient: process.env.TEST_LEGACY_AUTH_TOKEN
+      ? new AuthClient({
+          credentialProvider: CredentialProvider.fromEnvironmentVariable({
+            environmentVariableName: 'TEST_LEGACY_AUTH_TOKEN',
+          }),
+        })
+      : undefined,
     mgaAccountSessionTokenCacheClient:
       momentoCacheClientForTestingWithMgaAccountSessionToken(),
     mgaAccountSessionTokenTopicClient:
diff --git a/packages/client-sdk-web/test/integration/integration-setup.ts b/packages/client-sdk-web/test/integration/integration-setup.ts
index ae0ce96e9..b61081913 100644
--- a/packages/client-sdk-web/test/integration/integration-setup.ts
+++ b/packages/client-sdk-web/test/integration/integration-setup.ts
@@ -255,7 +255,7 @@ export function SetupLeaderboardIntegrationTest(): {
 
 export function SetupAuthClientIntegrationTest(): {
   mgaAccountSessionTokenAuthClient: AuthClient;
-  legacyTokenAuthClient: AuthClient;
+  legacyTokenAuthClient: AuthClient | undefined;
   mgaAccountSessionTokenCacheClient: CacheClient;
   mgaAccountSessionTokenTopicClient: TopicClient;
   authTokenAuthClientFactory: (authToken: string) => AuthClient;
@@ -288,11 +288,13 @@ export function SetupAuthClientIntegrationTest(): {
     mgaAccountSessionTokenAuthClient: new AuthClient({
       credentialProvider: mgaAccountSessionTokenCredsProvider(),
     }),
-    legacyTokenAuthClient: new AuthClient({
-      credentialProvider: CredentialProvider.fromEnvironmentVariable({
-        environmentVariableName: 'TEST_LEGACY_AUTH_TOKEN',
-      }),
-    }),
+    legacyTokenAuthClient: process.env.TEST_LEGACY_AUTH_TOKEN
+      ? new AuthClient({
+          credentialProvider: CredentialProvider.fromEnvironmentVariable({
+            environmentVariableName: 'TEST_LEGACY_AUTH_TOKEN',
+          }),
+        })
+      : undefined,
     mgaAccountSessionTokenCacheClient:
       momentoCacheClientForTestingWithMgaAccountSessionToken(),
     mgaAccountSessionTokenTopicClient:
diff --git a/packages/common-integration-tests/src/auth/auth-client.ts b/packages/common-integration-tests/src/auth/auth-client.ts
index af54e7e4a..550e1a7d2 100644
--- a/packages/common-integration-tests/src/auth/auth-client.ts
+++ b/packages/common-integration-tests/src/auth/auth-client.ts
@@ -45,7 +45,7 @@ const SUPER_USER_PERMISSIONS: PermissionScope =
 
 export function runAuthClientTests(
   sessionTokenAuthClient: IAuthClient,
-  legacyTokenAuthClient: IAuthClient,
+  legacyTokenAuthClient: IAuthClient | undefined,
   sessionTokenCacheClient: ICacheClient,
   sessionTokenTopicClient: ITopicClient,
   authTokenAuthClientFactory: (authToken: string) => IAuthClient,
@@ -400,24 +400,32 @@ export function runAuthClientTests(
       }, `Unexpected response: ${generateResponse.toString()}`);
     });
 
-    it('should not support generating a superuser token when authenticated via a legacy token', async () => {
-      const generateResponse = await legacyTokenAuthClient.generateApiKey(
-        SUPER_USER_PERMISSIONS,
-        ExpiresIn.seconds(1)
-      );
-      expectWithMessage(() => {
-        expect(generateResponse).toBeInstanceOf(GenerateApiKey.Error);
-      }, `Unexpected response: ${generateResponse.toString()}`);
-    });
+    // skip the legacy auth token tests if the env var isn't set
+    const describeFn = legacyTokenAuthClient ? describe : describe.skip;
+    describeFn('legacy token behavior', () => {
+      // Safe: this block only runs when describeFn is not `describe.skip`, which means legacyTokenAuthClient is defined.
+      // eslint-disable-next-line @typescript-eslint/no-non-null-assertion
+      const client = legacyTokenAuthClient!;
 
-    it('should not support generating an AllDataReadWrite token when authenticated via a legacy token', async () => {
-      const generateResponse = await legacyTokenAuthClient.generateApiKey(
-        AllDataReadWrite,
-        ExpiresIn.seconds(1)
-      );
-      expectWithMessage(() => {
-        expect(generateResponse).toBeInstanceOf(GenerateApiKey.Error);
-      }, `Unexpected response: ${generateResponse.toString()}`);
+      it('should not support generating a superuser token when authenticated via a legacy token', async () => {
+        const generateResponse = await client.generateApiKey(
+          SUPER_USER_PERMISSIONS,
+          ExpiresIn.seconds(1)
+        );
+        expectWithMessage(() => {
+          expect(generateResponse).toBeInstanceOf(GenerateApiKey.Error);
+        }, `Unexpected response: ${generateResponse.toString()}`);
+      });
+
+      it('should not support generating an AllDataReadWrite token when authenticated via a legacy token', async () => {
+        const generateResponse = await client.generateApiKey(
+          AllDataReadWrite,
+          ExpiresIn.seconds(1)
+        );
+        expectWithMessage(() => {
+          expect(generateResponse).toBeInstanceOf(GenerateApiKey.Error);
+        }, `Unexpected response: ${generateResponse.toString()}`);
+      });
     });
   });