I literally was in the country for 2 days. Went to the immigration office and copper a fine. I was reapplying for marriage visa after arriving on tourist visa (exempt for Aussies). Twas informed I didn't advise my residence and was fined 2,000b in Bangkok. It is what it is. Cannot argue with them. Just smile and say sorry, pay the fine.
Nope. I have multi entry marriage visa. I only stay for less than a month. I have not ever had the need to do a 90 dwy report The fine was for not registering at a condo of a friend, although not was literally 2 or 3 days.