Not all partnerships can use piggyback pixels. Permissions to use piggyback pixels are set in your partnership contract, and can vary from partnership to partnership.
From the top navigation bar, select Brands → My Brands.
Select the name of the brand you want to find piggyback pixel permissions for.
In the right-hand column of the slide-out, select the Details tab.
In the How we track section, find Pixel Piggyback block.
If there is a green [Check] on the block, you can use piggyback pixels for this campaign.
If the block is greyed out, you cannot use piggyback pixels for this campaign.