Hi Francesco!
Ok since other email notifications are working well, this rule out any issue with Mail server.
Do not worry, I’m here until you find a fix to this problem. Let’s just try one of these two solutions.
1. Can you turn off all other plugins, switch to default theme, then test the password reset email again? If we find a conflict plugin, then that will make it easy.
2. Can you try to reset password for another email? e.g. another domain. Will the email work? Please also make sure the email already exists in your WordPress users database.
Let me know if any of these steps solved it.
Best,
Ahmed