There are 3 sections where an ad unit div or body tag should be implemented:
Step 1: GAM ad unit code
Step 2: Source code within <head> </head> or PubGuru Header Bidding configuration
Step 3: Source code, within the <body> </body>, where the ad is supposed to show
Step 1: Audit Div IDs/Slot IDs in the source code (Open the website > Right click > View Page Source)
Step 2: CTRL+F the slot ID/div ID
Off-page setup: You should see at least 1 result on the body
On-page setup: CTRL+F ‘defineslot’, to locate the header tags
… then CTRL + F slot ID/div ID
If you see in your results that you have 3 matches (1 on the header, 2 on the body) then that means that the div id is set up properly.
Step 3: If it’s missing on page, verify if this unit should be part of the ad map. If not, remove it from the Header Bidding configuration. If yes, the code should be added on page.