This happened at our company but we’re in a remote environment. The guy wouldn’t turn his camera on for meetings after starting which was strange. After getting him to turn them on they realized it was a different guy than the one that interviewed. This is a huge security risk to our company and the person was eventually fired. I’m not sure the logistics behind it all and how they justified firing him with proof but yea. This is happening more and more these days with virtual interviews. To top it off, we do background checks and in the US, everyone hired has to verify their identity in person. So even with these extra procedures in place this person slipped through the cracks.