MP Analytics- data not flowing

Hi I've been trying to get analytics to track my eCommerce conversions for over a year.

It used to work flawlessly but for some reason last year it stopped working. I've spent quite a lot of time trying to work out how to fix it using Chrome extensions but a solution is beyond me.

It is only the MP pages that are affected.

Support access is enabled. Any assistance gratefully accepted.

Thanks
Paul