Are both the shifters not working - as in, neither derailer works ?. That would indicate bad main battery, in which case Kontact has this, sounds like a bad main battery. Either pull it or brig the bike to a shop, they can use the shop lever diagnostics software to look at the battery. Should be a warranty replacement at this early stage.

Or just Amazon a replacement to have as backup, then deal with the bad battery whenever. I keep a 2nd battery as just in case,