To enable the highest accuracy tracking of Bing Ads follow this guide on how to place the ThoughtMetric tracking parameter on your Bing Ads.
ThoughtMetric Bing Ads tracking parameter:
{lpurl}?tmsrc=bingad&tmcid={CampaignId}&tmsid={AdGroupId}&tmid={AdId}&tmkw={keyword:default}
1.) Copy the ThoughtMetric Tracking Parameter
2.) Go to the Bing Ads website. From the collapsible menu on the left, select All campaigns > Settings > Account level options.
3.) Paste the ThoughtMetric tracking parameter into the Tracking Template box.
4.) Enable the Auto-tagging of Click ID checkbox
5.) Click Save
How to handle parameters that are already in the tracking template
If you already have some tracking parameters in the tracking template field, don't worry, you can use the ThoughtMetric tracking parameters in addition to any tracking you already have in place.
To use the ThoughtMetric parameters alongside your existing tracking template you will want to append our tracking parameters to the end of your existing UTM string by using a "&" symbol starting with the tmsrc parameter.
For example If you already had the following text in your tracking template:
{lpurl}?utm_source=bing
You would want to append the ThoughtMetric tracking parameters so that the end result looks like this:
{lpurl}?utm_source=bing&tmsrc=bingad&tmcid={CampaignId}&tmsid={AdGroupId}&tmid={AdId}&tmkw={keyword:default}