Meaning: You get this notification as a warning for ad networks not detected/configured in any of your ad units.
Step 1: If this is expected, ignore this warning.
Step 2: If this bidder is supposed to be active, check if you have the right bidder adapter chosen in the configuration:
Step 3: Revisit the header bidding matrix for reference on the official prebid adapter by bidder on this page: https://goo.gl/dqkgGu
Step 4: Verify the Placement IDS (PIDs)/parameters are correct.
Step 5: Is traffic control set to 100%? If not, header bidding might not load in 100% of your page views.
Step 6: If everything looks good and the warning persists, contact our support team.