What should I do if Google tells me that my product URLs are incorrect?

If Google finds errors in product links, as below:

or, when you export each combination as a product in its own rights, you don't see them in the feed, you must:

• Check that you have a version of the module equal to or higher than 4.7.24 (if you have the standard version of the Google Merchant Center module) or equal to or higher than 1.7.7 (if you have the Pro version), and if it's not the case, update it
• Select "YES" for the following option, that is in the "Feed data options" tab of the "Feed management" section:

• Save
• Regenerate the product feed and reimport it in Google Merchant Center