A couple of things to note. PB has cut down the userID from five characters to three. They also are not providing a userID if a new user joins a table. So when you join, user ID’s are given, and then if someone leaves and a new person sits, there’s no ID provided.
We’re still looking to see if there’s any other routes to get this info, but initially it does not appear to be the case. I assume this is a measure to cut down on info and make the tables actually more anonymous.