For the last 15 days I have been trying to submit my 90 Day report online. After calling many times, today I was told before I can submit my TM47 electronically that I first must register and submit my TM30 Notification of Residence through the Thai Immigration website first. After many attempts I was able to accomplish this. I discovered you cannot use the Safari browser. I was able to use Google Chrome successfully and I was told on another call it is also ok to use Explorer.
Unfortunately I will not be able to find out if I can now file my TM47 90 Day notification until August because I ran out of time and had to file in person in Phetchaburi last week.
I hope this helps some of you avoid the many steps and calls I went through.
TLDR : Answer Summary
The user shares their experience of trying to submit their 90 Day Report (TM47) online, explaining that they had to first register and submit the TM30 Notification of Residence on the Thai Immigration website. They encountered issues with the Safari browser but found success using Google Chrome or Explorer. Ultimately, they had to file their TM47 in person due to time constraints and hope their experience helps others avoid similar difficulties.