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Is GTC Balance built in for Forerunner 255 or do I need another device?

I am trying to view my GTC balance during/after my runs, but it just shows as --:--. I chatted with a Garmin rep, who found some info that I might need to have another accessory, but I found the information unclear. So asking here, should my 255 watch be able to display the GTC balance stat on its own?