As far as I know, teachers in many Japanese training institutions do not actually have the so-called "Japanese teacher qualification certificate". Some just have a relatively high level of Japanese, and it does not rule out that some of them do have teacher qualification certificates. If you plan to be a Japanese teacher, in fact, the N 1 certificate is barely acceptable now. Of course, if you want to be a professional, you need more certificates. For example, JTEST, BJT, Shanghai Japanese translation and so on. If all three certificates can be obtained, it should be said that there will be no problem.