I agree with David as well. Like him I was certified trainer in logic till 2020, and master trainer in logic 9 as well. I got my train the trainer certification in London in 2012.
There is no official way to get certified in Logic anymore.
I used to train logic officially in Italy, in AATC, and now with the same method I'm training in classrooms and online. I'm giving a "Prosuono" certificate to my students, but nothing official.
Let's say that if you attend a former certified trainer class, for sure you will get a proper training method to teach as well. This doesn't mean you will be the best in using logic, but for sure one of the best for method to teach logic.