Variantgroup not being added to product

I have a product

Dynamicweb.eCommerce.Products.Product product = new Dynamicweb.eCommerce.Products.Product();
product.Name = "Test product";
product.Save();

And a variantgroup

Dynamicweb.eCommerce.Variants.VariantGroup newGroup =  Dynamicweb.eCommerce.Variants.VariantGroup.Create("variantGroupFor_" + product.ID);
newGroup.LanguageID = "LANG1";
newGroup.Name = product.ID;
newGroup.Label = product.ID;
newGroup.Save();

I've added a variant to the group

Dynamicweb.eCommerce.Variants.VariantOption Opt = new Dynamicweb.eCommerce.Variants.VariantOption();
Opt.Name = "Variant option";
Opt.GroupID = newGroup.ID;
Opt.LanguageID = "LANG1";
Opt.Save();

newGroup.VariantOptions.Add(Opt);

newGroup.Save();

Now, all this works fine. The variantgroup is created in the Management Center, and the option is created in the variantgroup.

The problem is, when i try to add the variantgroup to the product

product.AddVariantGroup(newGroup);
product.Save();

The group is not added, and therefor not visible in the "Variants" part of the product in the eCommerce backpanel?

Any idea, whats up?

Best regards

Jonas

Developer forum

Variantgroup not being added to product

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