I created the parent (super) and used the 'create configuration' to choose the attribute and create the children.
My skus are long, could this be causing the problem (i.e. 083-000022-Chartreuse Lime ...
in magento2 the length of sku is set in file module-catalog/Model/Product/Attribute/Backend/Sku.php
const SKU_MAX_LENGTH = 64;
how to increase the length of the sku in magento2?
here is the class: