@Tony *********
the TM 30 you get from owner. In my case my agent arranged it. Also tourist at hotels need to bring copy/screenshot of TM30 for visa extension or now also CoR.
I always had to show TM 30 for pretty much anything i did at immigration.
What office are you connected to? I know different locations have different processes (in classic thai fashion)
At least for Bangkok TM30 is what they require