is there more than one TM 30 registration system. Did you have to create an immigration account before you could actually get to the TM 30 form? did you have to upload documents pertaining to where you were living?
applying online is not that easy. First you have to open an immigration account and download certain documents. Once your account application is accepted you can register your stay, and that's a bit confusing. Best just to go to local immigration and have them fill it out for you. I would imagine after two weeks when the visitors leave and pass thru immigration to get stamped out, It might raise some eyebrows if there is no record of their lodging.