Not charging was working while it was charged

@champtichaubey couple of things you could try. If you are sure that your charger is working, get a USB-C ammeter and connect it between the tablet and the charger. Let us know how many amps your tablet "pulls". If is does not, then the issue could be the battery or the charging port. For that, you will have to take it apart. Now, if your tablet is a M10 (TB-X605F) use this guide to work on it. If it is a TB-X505F then you are in luck. That model has a separate charging board. To work on that, use this guide

If it is neither, let us know what exact model yours is.

While you work on your tablet, take lots of pictures. Once you are done with it, take those pictures and create a guide for iFixit. That will help the next person that has the same problem as you do. It's easy and fun to create these guides. https://ifixit.com/Guide/new The iFixit community will appreciate this.

Repair is War on Entropy!