My joycon doesn't connect to ring con

Hi all!
I have a issue with my right joycon. It works with Nintendo such as charging, connecting and playing but does not connect with ringcon.
(I attached image!)
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My ringcon works well and I guess it’s my joycon’s issue. I looked up inside but looks doesn’t have any problem with cables.

Does anyone know a solution? Do I need change a my joycon’s sliding part? I appreciate you all help :)!