diff --git a/modules/intentIqIdSystem.ts b/modules/intentIqIdSystem.ts
index ed78652ecb2..f5b40ded326 100644
--- a/modules/intentIqIdSystem.ts
+++ b/modules/intentIqIdSystem.ts
@@ -474,11 +474,16 @@ export const intentIqIdSubmodule = {
     const cmpData = getCmpData();
     const gdprDetected = cmpData.gdprString;
     firstPartyData = tryParse(readData(FIRST_PARTY_KEY_FINAL, allowedStorage) as string);
-    actualABGroup = defineABTestingGroup(configParams, partnerData?.terminationCause);
-    if (groupChanged) groupChanged(actualABGroup, partnerData?.terminationCause);
     const currentBrowserLowerCase = detectBrowser();
     const browserBlackList = typeof configParams.browserBlackList === 'string' ? configParams.browserBlackList.toLowerCase() : '';
     const isBlacklisted = browserBlackList?.includes(currentBrowserLowerCase);
+
+    if (!isBlacklisted) {
+      actualABGroup = defineABTestingGroup(configParams, partnerData?.terminationCause);
+      if (groupChanged) groupChanged(actualABGroup, partnerData?.terminationCause);
+    } else {
+      actualABGroup = undefined;
+    }
     let newUser = false;
 
     setGamReporting(gamObjectReference, gamParameterName, actualABGroup, isBlacklisted);
diff --git a/test/spec/modules/intentIqIdSystem_spec.js b/test/spec/modules/intentIqIdSystem_spec.js
index 279fd9cc5bb..c1e01ef9439 100644
--- a/test/spec/modules/intentIqIdSystem_spec.js
+++ b/test/spec/modules/intentIqIdSystem_spec.js
@@ -2029,6 +2029,79 @@ describe('IntentIQ tests', function () {
     expect(groupChangedSpy.calledWith(usedGroup)).to.be.true;
   });
 
+  it('should NOT call groupChanged when the current browser is blacklisted', async function () {
+    const groupChangedSpy = sinon.spy();
+    const blk = detectBrowser();
+    const configParams = {
+      params: {
+        ...defaultConfigParams.params,
+        browserBlackList: blk,
+        groupChanged: groupChangedSpy
+      }
+    };
+
+    intentIqIdSubmodule.getId(configParams);
+    await waitForClientHints();
+
+    expect(groupChangedSpy.called).to.be.false;
+  });
+
+  it('should not mark a test group on the sync pixel when the current browser is blacklisted', async function () {
+    const blk = detectBrowser();
+    const configParams = {
+      params: {
+        ...defaultConfigParams.params,
+        browserBlackList: blk
+      }
+    };
+
+    intentIqIdSubmodule.getId(configParams);
+    await waitForClientHints();
+
+    const pixelRequest = server.requests[0];
+    expect(pixelRequest).to.exist;
+    expect(pixelRequest.url).to.include('at=20');
+    expect(pixelRequest.url).to.not.include('testGroup=');
+    expect(pixelRequest.url).to.include('isInTestGroup=false');
+  });
+
+
+  it('should NOT call groupChanged when the current browser is blacklisted', async function () {
+    const groupChangedSpy = sinon.spy();
+    const blk = detectBrowser();
+    const configParams = {
+      params: {
+        ...defaultConfigParams.params,
+        browserBlackList: blk,
+        groupChanged: groupChangedSpy
+      }
+    };
+
+    intentIqIdSubmodule.getId(configParams);
+    await waitForClientHints();
+
+    expect(groupChangedSpy.called).to.be.false;
+  });
+
+  it('should not mark a test group on the sync pixel when the current browser is blacklisted', async function () {
+    const blk = detectBrowser();
+    const configParams = {
+      params: {
+        ...defaultConfigParams.params,
+        browserBlackList: blk
+      }
+    };
+
+    intentIqIdSubmodule.getId(configParams);
+    await waitForClientHints();
+
+    const pixelRequest = server.requests[0];
+    expect(pixelRequest).to.exist;
+    expect(pixelRequest.url).to.include('at=20');
+    expect(pixelRequest.url).to.not.include('testGroup=');
+    expect(pixelRequest.url).to.include('isInTestGroup=false');
+  });
+
   it('should include testPercentage with configured abPercentage in AT=39 URL', async function () {
     const callBackSpy = sinon.spy();
     const configParams = {