Not sure if this is the correct answer but I think you can actually do it yourself online
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My landlord asked me to do it myself and some other posts on here also talked about this. It’s really easy. Just register and then add yourself into the system. But I have a one-year contract which I scanned in and submitted it when filing the TM30.
Please delete if this is not accurate. Just stating my own experience.
I’ve arrived already. Halfway into my quarantine actually. Have a good flight to bkk! I really enjoyed my flight here as there was a lot of space on the plane 😆