woocommerce variable product attributes

So, I’m trying to add attributes to a variable product.

After creating a product, I go to ‘woocommerce product attributes’ and create an attributes (or was it sub-attribute?) list and ‘configure terms’. When I go back to my product, I go to the ‘attributes’ section, select my new attribute from the drop-down (boy I’m getting tired of the word ‘attribute’ at this point), then click “Add’….and nothing happens.

No idea why, but I’ve tried it 6 different times now, creating entirely new products and attribute lists and have followed advice from 3 different guides.

Pulling my hair out…