Some information if you are trying to do 90 Days report on line for Bangkok.
I always use online with no problems until now. Could not complete report and tried for 3 days on website and the App.
Had to go to MTT today. My 12 month extension for Non Imm O retirement was done 1 Oct to Nov 2021. Seems they are having trouble updating info at the moment. So I was showing as overstay. Also told the App is not working.
Pre booked appointment so in and out quickly but poorer by 600 baht in taxi fares. LOL.
TLDR : Answer Summary
Users are experiencing issues with the online system and mobile app for submitting their 90-day reports in Bangkok, leading some to visit the immigration office. The problems seem to be related to delays in updating visa information, as users have reported being shown as overstaying despite having valid extensions. Some have successfully navigated to MTT (Main Tax and Troops) for assistance, and public transport options like bus number 166 from Victory Monument are available as a cheaper alternative to taxis.