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We relaunched our website a couple of months back and since then the sessions and revenue data reported for DV360 insertion orders has fallen to 10% of it's pre-launch numbers. While the numbers reported in Display channel within Channel reporting has not been affected. dbm/cpm as source/medium within Display Channel has remained consistent. The impressions numbers have not changed.

We use auto-tagging to for both AdWords and DV360 systems. We had turned it off and went to utm tags but it didn't help the issue. On the landing page I see the correct dclid parameter and which is also sent in the /collect request to the google-analytics servers.

I'm seeing 2 warnings from the gtm.js library in Chrome browser console which could be related to this issue but I didn't find any information about them online.These are the errror messages:

unrecognized feature:'attribution-reporting'
unrecognized feature: 'conversion measurement'

Please see the screenshot. We have enabled "enable display advertising features" in Google Tag Manager. Chrome Developer Tools warning sreenshot

Could anyone point to probable reasons for this drop in DV360 and how to fix it?

user3608427
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    I voted to close this question because it is not a programming question and it is off-topic on Stack Overflow. Non-programming questions about your website should be asked on [webmasters.se]. You should delete this question here and ask it there. – Stephen Ostermiller Nov 16 '21 at 20:25

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