We solved the problem. We requested the review team two things.
・if the apple account is connected with our service, disconnect it and try to sign up again.
・if the apple account is not connected with our service, user another apple account and try to sign up again.
Then the review passed. I guess the connection between the apple account and the service had something wrong. It might be solved by reconnection.
Tesshu
Users receive reputation points by contributing quality content to the forums.
Posts include post and replies published on the forums.
Post authors can mark replies as Accepted to indicate successful solutions.
Apple Developer Forums admins can mark replies as Apple Recommended to indicate an approved solution