Hey there, title sums up what is wrong, the front left port (closest to the trackpad) has stopped working. when plugged into power the LED indicator turns on, but USB and HDMI modules do not work.
Could be a few issues going on. File a ticket with support to get the most educated response. Others have suggested resetting the mainboard if it is something that is stuck in the EC.
As I am typing this, there is a remote possibility something very small managed to get lodged into the connector. Had something similar happen to my Pixel phone a few years ago it was literally the tiniest piece of pocket lint and it covered a few pins. If I put the charging cable in one way, it would not charge, turned it around and it would work fine. What tipped me off is the cable no longer seated as far in when I plugged in the cable.
Unlike most automobiles, a laptop with 3 of the 4 ports working still gets the job done. Can’t do that with a faulty tire!