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I’m having the same issue on two different sites.
Fatal error: Uncaught ArgumentCountError: 3 arguments are required
Fatal error: Uncaught ArgumentCountError: 3 arguments are required,……
wp-content/plugins/contact-form-7/admin/includes/welcome-panel.php on line 148
wp-content/plugins/contact-form-7/admin/includes/welcome-panel.php on line 153
Where can we see the website in question?
I managed to solve the problem by rolled back to 5.8.
Unfortuanately 5.9 has the same issue. I didn’t bother to try the 3rd digit versions. 5.8.x may work or not.
My suggestion is that wpcf7_link has been updated to use 3 arguments but the usage of this functions are not.