OK, it is halfway down the heatthroat. There should be a PTFE tube there, so a blockage there is surprising for a machine with only 20 hours unless the temperature was too high for the PTFE tube and it deformed (or the chinese forgot to put one in?).

If you heat up the nozzle to 200C and use pliers to hold the heat block (carefull not to grip the heating element or thermistor), you can then unscrew the brass nozzle with a wrench without twisting the heat block. With the nozzle removed (it is hot, drop it on your heatbed), push filament through from the top. Most likely the PTFE with the blockage will pop out so you can inspect it. If there is no PTFE tube there you will need to get some (3mm OD and 2mm ID). If the PTFE tubed is deformed, replace it. If you can not remove the blockage, then replace the PTFE tube. ...... and order extra tube and extra nozzles from china so you have them handy when needed (you will need them in the future). It only costs a few dollars but you will need to wait a few weeks for them to arrive.