getProductVariants not working

Hello, I have a custom configurator in my website and to handle that I configured a backend method with following code:

return wixStoresBackend.getProductVariants(productId, options);

This method has the productId as a param and it is the _ID from BD.Stores.Products

It has been working for the last five years, but since friday it is not returning the variants for the given productId.

Have anything changed for this method getProductVariants since Friday?

Thanks in advance!