This is the technical support forum for WPML - the multilingual WordPress plugin.
Everyone can read, but only WPML clients can post here. WPML team is replying on the forum 6 days per week, 22 hours per day.
This thread is resolved. Here is a description of the problem and solution.
Problem: I cannot register my website because I'm getting the "invalid key" message.
Solution: Please make sure that you have all WPML related plugins up to date. If so, please delete the site key and create a new one.
If with the new site key you still getting the error, please report the issue on the support forum immediately because it may be a problem on our server and we would need to investigate the issue as soon as possible.
Relevant Documentation: https://wpml.org/faq/install-wpml/