Welcome to Thailand! Surprised they didn’t want to also know your neck, waist and shoe size. I’m sure there’s an immigration form for that as well somewhere...
AFAIK, you can’t do it till half way past/after your last 90-day report. I tried to do it early in 2019 and that’s what I was told. Had to let it lapse and start a new one.
Interesting. So both the online system for 90-day reporting is down and the mandatory appointment system is also down to do the same in person? Amazing Thailand. With only about 10% of the westerners now using immigration they still cant seem to cope? What do you do now if you cant get a mandatory appointment? Skip your 90-day reporting? And just pay a fine later?
Last time i did my 90-day report at CW, they told me in future, everyone will need to report physically e.g. in person. Has that changed back again to online being allowed? Hard to keep up with the regs these days.