Inoperable from the app
Reinstalled the app and re-logged in.
With the above operation, it was available to operate the vacuum cleaner from the app once.
However, when I looked at the app screen again while cleaning, the following message was displayed on the app home screen, and I fell into a state where I could not operate it.
Not available (red exclamation mark)
Make sure wi-fi is working and the robot vacuum cleaner is within range of your router.