Hideaki Morimoto

Problem:
The client is developing a site with four subsites on a multisite and is unsure if each subsite counts as a separate site for WPML site registration or if they count as one since they share the same domain.
Solution:
If you're developing a multisite and wondering about WPML site registration, we recommend using just one site key for all your multisite installations. First, add the OTGS Installer plugin to your main site and register it. Once you activate the WPML plugin on your subsites, they will already be registered. For more detailed guidance, please refer to our documentation on multisite support.

Please note that this solution might be outdated or not applicable to your specific case. We highly recommend checking related known issues at https://wpml.org/known-issues/, verifying the version of the permanent fix, and confirming that you have installed the latest versions of themes and plugins. If this does not resolve your issue, please open a new support ticket.