Iphone acting weird when plugged into LG soundbar?

I hooked up my iphone to my LG sound bar and when i plugged it in everything works except that its not charging properly. The charging icon in the battery at the top keeps going on and off on and off. Any suggestions?

Sometimes certain device make the iPhone say this device is not recgonized. If it works it is charging despite what you see. Just restart it and connect it

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