Welcome to the HP Forums, this is a great location to get assistance! I read your post and see that your HP Sprocket is not charging. I would like to help you resolve this issue.
However, I will need a few details to provide an accurate solution,
When dd this issue start?
Did you do any hardware or software changes?
Did you try with the different charging cable and different outlet?
Reset the printer. On the printer, locate the reset button underneath the paper cover, insert a straight pin into the reset button access point, and then press the reset button for 3 seconds. The printer resets and turns off.