Has anyone worked with tenancy and Laravel 9?

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I am working on a project where I am using tenancy with Laravel 9. I have different databases for different countries but a single codebase, which allows me to access different information depending on the domain I enter. So far, so good. The complexity arises when my client has asked me to allow any user to access any domain. In other words, if I am registered on the Spain website, I should be able to access the websites of the United States or Mexico with the same account. This is where tenancy and the synchronization of tenant databases with the global database come into play. If anyone has experience with these technologies, I would be eternally grateful for any assistance. Thank you very much.