Unfortunately, Line Corp. has about the worst customer service I’ve encountered. I needed to do a factory reset on my phone. I got all my apps running again, except for Line. The app asked for an SMS code AND a password for authentication. My old password didn’t work, and I’ve tried resetting it many times, but the app won’t accept it. I’ve submitted the customer inquiry form multiple times over the past 10 days. But no one from Line responds. And there’s no other way to contact the company.