Ever since a couple updates ago Elementor has changed the way you activate your license key for Elementor Pro. Previously you would have been able to activate your license using a key but now you need to login to your Elementor account to pair your site with your license.
Right now to activate your license you will go to
sitename/wp-admin/admin.php?page=elementor-license. This will take you to Elementor default connection.
That way works perfectly well as long as you are the primary account holder, but this new method has proven to be a headache for others working on the site that does not have direct access to the primary account.
The best way to resolve this is to change the url. You will want to change
sitename/wp-admin/admin.php?page=elementor-license&mode=manually. By adding the
&mode=manually parameters to the url you are able to access the manual activation.
Hopefully this was able to help, Happy Coding 🙂