Only the person who implemented the pixel can see the changes or make changes to it. If the pixel is not firing and you'd like to learn the reason why, you need to get in touch with the person who implemented it. However, it also makes sense to check the website with the Pixel Helper (an extension which enables you to see the pixels implemented in a website) to see if the pixel is still available.

The person who enabled the Offline Conversions option should go to the campaign if they want to disable it for the campaign, and needs to go to the BM Settings to disable it on BM. 

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