Do I have to report in person for my first 90-day reporting with a Non-OA Visa, and what if I'm out of the country?

For the first 90-day reporting on a Non-OA Visa, you must report in person to the Immigration office. If you leave Thailand before your 90 days are up, this will reset the reporting requirement upon your return, meaning you'll start a new 90-day count. While traveling outside the country, there is no need to report; the Non-OA Visa allows for multiple entries.