User with no devices

Hello,
I am facing with some kind of error. I have Blynk PLUS. I am the Device Owner and Developer. I have added a user, and for a very long time user could control the device. Suddenly one day a users app stops displaying the device. The message that comes is “No devices yet” You don’t have any devices connected yet". What can I do to connect my device to users app?

Before you create a new topic you should always search to check if there is an existing topic about the same issue.
In this case there is…

so I’ve closed this topic.

If you wnat to add to that existing topic then please do, but in future please search first.

Pete.