How can I fix my TWS S2 Earbuds, right one doesn't work

My right S2 Earbud has randomly stopped working. The light on it is still active and it does still connect via Bluetooth but there is no sound played. The left earbud seems to work fine

I already tried turning them on/off, reconnecting them to each other etc. But nothing seems to have worked so far. User Manual also doesn't help.

Any advice would be highly appreciated