I have a Master's but I do not have a teaching certificate yet in TEFL yet, can I teach abroad ?
Welcome to the forum! Typically they require you to have some teaching certification, If you are interested in teaching in Thailand, it will be important for you to research institutions/schools to clarify if they specify what type of training they are looking for their teachers to have, to determine if the certificate you choose will be accepted. It's possible that some employers look for a teaching practicum or a course that's offered in-person, however many schools accept online certificates. TEFL is an accredited and internationally recognized university.
Good luck with your search