Important: Amazon A9 works on version 0.20.5 or up
Step 1: Open your PubGuru header bidding configuration
Step 2: Re-check that you have the correct Publisher ID
Step 3: Check ‘Beta’ box and upgrade your Header Bidding version
Step 4: Save & publish
Step 5: Re-run PubGuru Ad Inspector (PGAI) after 10-15 mins.