Why is my right Joy-con not charging but works well when attached?

So all of a sudden, I detached both joycons to be able to use as one controller but my right one was not lighting up and I found out that it was supposedly “dead”. I attached it back to the console and was recognized but the battery was very low so I decided to charge it for a long time on the dock. After that time, the left one was charged while the right one was still the same. As for buttons, it works fine. The only thing that I noticed is that I cannot sync it when detached since it’s “dead” and will not charge when attached. I tried many solutions. I tried different forms of charging as well as disconnecting the AC adapter and it still won’t charge. I have not contacted Nintendo support just in case I found an answer here.