The Free, Explorer, and Maker plans allow personal users only. A personal app user is a user that signs into a Glide app using a personal email domain, such as Gmail, or an education email domain, such as .edu.
This is why gmail.com or docomo.ne.jp can log in successfully, since they are considered personal domains, but @i.softbank.jp is not.
You can use Glide’s validator to check.
