I have created a staging copy of my site to test the updates and have also added the staging URL to My Licenses. On accessing my dashboard it still says that X is not validated, so I can’t test the updates.
In your licence manager page I can see that you have added staging URL. The next step would be to validate the website using purchase code under X > Validation.
In case you are not able to validate, just try and revoke validation from X > Validation > Revoke Validation and then re-validate again.
For more information on product validation, please take a look at following article.