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[Escalated to WPML Developers team] Fatal error because WPML send_auth_cookies filter has too few arguments
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In PHP 7.4+ (including 8+) we get:
Fatal error: Uncaught ArgumentCountError: Too few arguments to function my_callback(), 1 passed in ....php on line x and exactly 4 expected in ...
We get this whenever this class is loaded - it seems only if language per domain SSO is used from the class name.