Firstly, you shouldnt really use it whilst charging. Itll fuck the battery quick
Secondly, I think there lies your problem, a generic phone lead. Those kunts at Apple and Samsung have those phones reject non propietary leads so they don't fast charge like their leads and thats probably whats sending you the message.
Try a genuine Samsung lead and plug in it.
Thirdly
Those things dont charge fast and use the old non usbc plugs from he Samsung s6 to plug into them.
They are only good as a phone stand and to make your phone look like an alarm clock on your bedside. They take hours to chqrge a phone.
You'd be better off spending that dosh on a replacement Samsung lead and the real fast charging plug that they come with..
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