Sometimes, ads on your homepage may not render correctly. One common reason is a DIV ID mismatch. The DIV ID is the unique identifier that links your ad slot in Google Ad Manager (GAM) with the ad code implemented on the site.

Step 1: DIV ID

• Every ad slot has a unique div id that tells the browser where to display the ad.
• Example from ad code:
  <div id='div-gpt-ad-1707890739030-0'></div>
• Important: In most cases, the DIV ID is part of the custom code section of your Page Builder widget. It must match exactly with the one defined in GAM.

Step 2: Log in to Google Ad Manager (GAM)

1. Open Google Ad Manager in your browser.
2. Locate the Ad Unit

• In GAM, go to Inventory → Ad units.
• Search for the ad unit name, e.g., EDX_HOMEPAGE_300x250_MID.
• Open the ad unit details.

Check these points:

• Sizes: Should match the ad code (e.g., 300x250).
• Parent unit: Must be assigned under the homepage or main site section.
• Ad unit ID / code: The GPT DIV ID used in GAM should match the one in the Page Builder custom code.

Step 4: Check Line Items

1. Go to Delivery → Orders in GAM.
2. Open the order serving this ad unit and check the line items.

Verify:

• Targeting: Must include the homepage or all pages where the ad should appear.
• Creatives: 300x250 creatives are attached.
• Status: Should be Active, not paused
• Start & End Dates: Ensure the ad is currently scheduled to run.

Step 5: Verify the Widget in Page Builder

1. Open Page Builder.
2. Locate the widget containing your ad slot.
3. Check the following:

• Custom Code / DIV ID: Ensure the DIV ID matches exactly with GAM.
• Lazy Load / Performance Settings: Temporarily disable to test if the ad renders immediately.
• Scripts: Ensure there are no conflicting GPT or DFP scripts.

Step 6: Test Ad Rendering on Homepage

1. Open the homepage in your browser.
2. Refresh the page normally (Ctrl+R / Cmd+R).
3. Check if the ad appears immediately

If the ad only appears after a hard refresh:

• Recheck the DIV ID alignment.
• Adjust lazy load settings in Page Builder.
• Look for script conflicts or duplicate ad initialization.

Key Tips

• The DIV ID must be unique for every ad slot on the page.
• Always use the custom code section in Page Builder for GPT/DFP ad scripts.
• Misaligned DIV IDs are the most common reason ads do not render correctly on initial page load.