We'd like to inform you about a service outage regarding the Messaging API. The issue has now been resolved but we sincerely apologize for any inconvenience that this may have caused.
# Date of recovery
Date: June 27, 2018 JST (GMT+9)
# Cause of the outage
Issue with our servers.
When the Messaging API was called to unlink a rich menu from a user that was not in a chat with the bot, the rich menu was not unlinked from the user. This issue occured only to users with LINE 8.7.0 or later for iOS and rich menus configured at admin-official.line.me.
We will continue to improve the quality of the services we provide to our developers and we greatly appreciate your understanding.