Tim de Pater

Problem:
The client is experiencing an issue with an invalid site key error and their URL has been blocked due to a high number of requests to the server.

Solution:
We recommend updating all functionalities of the site to the latest versions. Once this is done, inform us so that our system specialists can proceed with unblocking the URL. The blockage is due to the high number of requests which can be mitigated by updating the site. It is important to communicate with the client to get approval for these updates. If the site remains blocked, some functionalities of WPML may not work as expected.

If this solution does not seem relevant to your situation, please open a new support ticket with us.