Xbox Series S Controller not working

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 Does the controller turn on by itself if it is connected directly to the Xbox (bypassing the K2)?

If it does not, you will need to get a USB-C charge and sync cable for next gen controllers (Series S/X).

The K2's box comes with a Micro USB charge and sync cable that will work on old gen Xbox One controllers which could be the reason why only your old gen controller works.

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Should it be turning on by itself? I have to manually turn it on. Could this mean that the cord isn’t outputting enough power?

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If it is requiring you to press the home button to power on after being connected, this means that it is not a sync cable which is required to sync with the K2. The cable we provide in the box is a sync cable so it will power on the controller without needing to press the home button. However, it is a micro usb cable which will only work on the older controllers since the new gen controllers are now USB-C.

If you go out looking for one just ensure that the product states that it is a "charge and sync" cable.