I moved my store to Shopify and had Google Ads already set up previously whilst I was using another store platform. All my products were approved by Google Ads back then.
Now I installed the Google Shopping App, it started synchronising my products and half of the products come back with having disapproved due to policy violation.
I dug deeper and it turns out that Google disapproves of 1 colour variant of my products. With every single product. Just that one colour.
I tried to change the name of the colour slightly, still disapproved.