Remarketing Tag Error
Re: Remarketing Tag Error
There is a possibility that if you added the remarketing tag just now, AdWords system might not have tracked it and is giving the message that tag not detected. If this is the case, I would suggest you to give it sometime till this message gets over and your list start accumulating.
This help center article lists remarketing tag validations and alerts and would be useful for you: https://support.google.com/adwords/answer/3103509