Hi @davidricota,
Indeed, that was a bug. I think that we’ve fixed it in v2.2.2 onwards.
Please, test it. Any problems, notify us here.
Regards!
Hi team, thanks for your answer.
i’m still have the same problem, i created a new user, i installed again wordpress and uploaded woocommerce and updated the last version of woo mercado pago.
you can check here

Now i can add a recurrent product. but i cant set correctly keys.