Can my friend report his 90-day visa in Korat instead of Bangkok?

A user seeks advice on whether their friend, who has a retirement visa, must return to Bangkok for a 90-day report or if they can report it at the immigration office in Korat, since online reporting is currently unavailable due to system issues. The consensus from the comments is that while typically, the 90-day report should be filed at the office linked to the individual's primary address, there are options available such as reporting at the local office in Korat if the hotel or accommodation has notified local immigration. Alternatives include reporting by post or understanding the implications of filing late.