Go to your TikTok Ads Manager, and go to Ads tab.

Select all ads using the checkbox in the header and click on Edit ads. This will edit all ads, in bulk

Add the following parameters to the URL of every add: ttadid=__CID__&ttadname=__CID_NAME__ 

Don’t forget to save the new change

Now, make sure to set up the TikTok integration, if you haven’t done that already