If you're seeing a message in Ad Manager which states 'There was an error and our engineers have been notified' this means you have some outstanding issues with Google, which is preventing you from accessing Google Ad Manager.
We're unable to work with sites that have outstanding issues with Google - if you'd like to continue monetizing with Ezoic, then you'll need to get any outstanding policy issues with Google overturned. You can view a full list of their publisher policies here
https://support.google.com/admanager/answer/10502938?hl=en
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