I’ll always recommend sending a message to support, but if you want to do more troubleshooting on your own, we could use a little bit more info to help you.
Is this an 11th gen, 12th gen, or Chromebook Edition?
What OS do you have installed?
Have you tried multiple different USB-C ports on the laptop/expansion cards to rule out a bad port or bad card?
(longest shot) have you tried a different wall outlet? (very likely not the solution, but had to check)