It's annoying, we know. There are two reasons this can happen.
1. NATS creates temporary random usernames before users join.
This is an internal mechanism that NATS uses to track visitors to your tour. Once the user had joined the site, NATS updates the random username to the username chosen by the user.
#2 Vendo creates random usernames after the user joins.
When we host the prejoin page, we collect the user details including the username.
If a username was already taken by another user then our platform will generate a new random username. The format of these random usernames is: userXYZM, for example: user12345
Our platform uses the checkUser callback to check whether the username that the user picked is available in your platform. CheckUser documentation is here.
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