When exporting url keys you have two options:

• You can choose to map the url_key field in the connector. In this case Akeneo is leading.
• Map nothing and let Magento decide which url_key must be created. In this case Magento will use the product’s name field value of Magento to create an url_key.

Whatever option you choose make sure that url_keys are unique between the products. Otherwise Magento will throw duplicate url_key errors and the products will not get created. If you choose for option two, and your project has product models, make sure you use two different name attributes in the ab mapping. One attribute for the model and one for it’s variants.