Hello Daniel,
Thank you for your message,
I’ve proceeded exactly the way its explained on the woocommerce website.
When I save the product, all the variations added and work properly but when I return to edit the variations the product data box completely get disabled.
All the options do not work and I can not edit anything.
Here’s the link for the screenshot of the product after saving.
https://ibb.co/q7BzBTk