"This e-mail address is already in use" was displayed.

In addition to duplication within your learningBOX environment, an error will be displayed if the same email address is used in different owner accounts. Try either methods as follows to deal with this problem:

・Register with a different email address

・Change the email address of another owner account or cancel the account

・Register email address using the alias function

e.g.)

xxxxxxxx@learningbox.co.jp …Original email address

xxxxxxxx++user1@learningbox.co.jp …①

xxxxxxxx++user2@learningbox.co.jp …②

All emails received in ① and ② will be delivered to "xxxxxxxx@learningbox.co.jp".

For more details, refer to the following link: