If the Beats Studio 3 wireless headphones are not charging, you can try the following:
Check the charging cable. Make sure that it is not damaged and is securely connected to the headphones and the power source. You can try using a different charging cable or adapter.
Restart the headphones. To do this, turn off the headphones, disconnect them from any devices and leave them off for a few minutes. Then turn it on and try to charge it again.
Clear the charging port. Over time, dirt can accumulate in it, which prevents proper connection. For cleaning, you need to use a clean, soft-bristled brush or a can of compressed air.
Perform a factory reset. To do this, press and hold the power button and the volume down button simultaneously for about 10 seconds until the LED indicator flashes. Then connect the headphones to the charging cable and check if they have started charging.
If none of the above helps, there may be a hardware problem with the headphones. In this case, you should contact the official Beats support service or an authorized service center.