I literally just had this conversation.

H: Me
C: Colleague

C: "Hey Hindsight, I'm having issues with our web print driver, it's not opening the browser after printing"
H: "Have you checked Interactive Mode in the installer so it opens the browser?"
C: "Yes"
H: "Are you sure you have the right domain name in your configuration file? It should be <thing.example.com>"
C: "Ah, it's just example.com. Should I just change it in the config?"
H: "No you need to regenerate the config from our server tool, because the server data needs to match your client config data"
C: "Ok, my config says <example.com>"
H: "Yes, just regenerate the config with <thing.example.com> instead for the domain"
C: "Ok I'll do that. What was the correct domain again?"
H: thinking "Holy shit can you really be that dumb!" but saying "<thing.example.com>"