one
The earphone may not be used for a long time, and the Type-C port is dirty.
two
It may also be that the charging cable or charging connector is damaged so that it cannot be charged, and the earphone is not used for a long time, and it needs to be charged for a long time, or it needs to be plugged and unplugged several times. Please clean the USB port and try again, or replace the charging cable or charging port to charge.