Xbox One S controller connect issues?

I have 2 controllers and neither are connecting to my xbox. I've tried to sync both using the sync button on the xbox and the controllers. I've also tried connecting both to the xbox via usb cable. But both controllers just flash. They were just working 2 days ago and now they aren't connected and I can't seem to connect them. Any thoughts?

Update:

Update: I just reset the xbox and the controller connected to it for about 5 seconds then disconnected, but still wont reconnect

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