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Please make sure sub IDs you have added to the click URL are configured properly. If they aren’t, tracking of the initial click might be tackled.
The IP address from which you are processing a test might be blacklisted. Many companies run call centers processing orders by phone: to avoid these conversions being attributed to partners, the IP address is blocked for tracking.
Please make sure the confirmation page of your advertiser does not contain any javascript errors. Javascript errors can keep the tracking code from being run. This error is particularly common when container tag implementation is used.
The combination of tracking category, conversion target and conversion ID must be unique for an order to be tracked. Therefore, be very careful with reloading the confirmation page or using the same conversion ID twice.
Validate tracking URLs using preview mode
You can call any tracking URL in preview mode just adding at the end: &preview_mode=1
For more information about the preview mode, please read this article.