Two items to try. 1. Reinstall the Intel motherboard chipset device drivers.  One of the things the drivers do is define (identify) all the devices on the motherboard and attached devices.   2.  If the chipset drivers don't fix it, try a CMOS memory reset.  Power off PC, disconnect the AC power cord, press the power button for 10 seconds to drain any residual power.  Open the case and locate the 2032 coin cell battery on the motherboard.  Remove the battery for at least 5 minutes.  Reinstall battery, reconnect AC power cord, power on and see if the NIC is detected. Support for XPS 8930 | Drivers & Downloads | Dell US
  XPS 8930 [IMAGE] I just installed a bios update named: Dell XPS 8930 System BIOS -1.1.17 -6.29 MB Critical. I had been using wired ethernet with no problems.  It took me almost 1 whole year to be able to re-install the adapter after it erased on me. I kept getting the message "no compatible hardware was detected". I suspected Dell Support Assist suggested updates had something to do with it yet, wasn't sure?  This was until Dell through a Support Assist Software Updates run offered me an ethernet driver and surprisingly it re-installed? This happened in May 30th, 2021.  Now with this recent Bios update installed last night, I am back to square one? The ethernet adapter is missing?  I cannot begin to wrap my head around what could be causing this "no compatible hardware was detected. The adapter was installed/working just fine before this? Dell CC? Anyone? See Attachments for idea.      
XPS 8930, Bios update did it to me again! So frustrating