Hello There,
Thanks for writing in! Since you have mentioned that there are two dev working for you site, I would recommend that you assign the license for your dev 1 and dev 2 temporarily. Once you are going to make the site live, you can always revoke the license and re assign it to the live site.
And please review the changes that we made on how you are going to validated your X theme because we made a big change in the process. Please check it out here: https://community.theme.co/kb/product-validation/
Hope this helps.