I had the same problem with a 15 inch MacBook Pro (I restored from a Time Machine backup from my old MacBook which was running Sierra, that managed to leave the machine in a completely unbootable state). After much Googling (and lots of luck!) I found out about needing to recover BridgeOS on the T2 chip by putting the machine into DFU. Yes before that I also spent hours at the Genius Bar and a “lead” technical guy on Apple Support. They were completely useless!
Here’s a site I found that has detail about the procedure:
Now I’m pretty sure the 16inch is still returnable to the store? I bought mine the day it was announced and I have until January 2020 to return it. Perhaps you want to check your return date?
I had the same problem with a 15 inch MacBook Pro (I restored from a Time Machine backup from my old MacBook which was running Sierra, that managed to leave the machine in a completely unbootable state). After much Googling (and lots of luck!) I found out about needing to recover BridgeOS on the T2 chip by putting the machine into DFU. Yes before that I also spent hours at the Genius Bar and a “lead” technical guy on Apple Support. They were completely useless!
Here’s a site I found that has detail about the procedure:
https://mrmacintosh.com/how-to-restore-bridgeos-on-a-t2-mac-how-to-put-a-mac-into-dfu-mode/
I didn’t use this particular website to bring the 15 inch back to life. So can’t really vouch for its correctness.
Now I’m pretty sure the 16inch is still returnable to the store? I bought mine the day it was announced and I have until January 2020 to return it. Perhaps you want to check your return date?