As far as I am aware, no broker will take the MXSG certs at the current time. The stock price needs to be higher. This has nothing to do, per se, with MXSG. I doubt any OTC stock at 20 cents would be accepted by any broker out there.
You need to be patient and wait for the price to rise at least above 25 cents. That will happen when we get news of a production start or first pour.
I realize that is not the answer you want to hear right now. But I don't think there is any other answer.