Ive run into this several time on machines with failing or failed Touch Bars. It's my understanding the Touch Bar has its OWN operating software and this is what's flagging the problem. I had to replace the top case and even then I got the. message... once, but when I restarted I saw people posting about using Ethernet instead of Wifi. I did that and it worked. Customer had the issue pop up ONCE more for her, but she was able to restart t he computer and it went away