Harmony test for twin gender anyone?

Question

Has anyone done the harmony test for gender of their twins? What percent fetal fraction did you have and was it accurate?My harmony test only had 6% of fetal fraction. I worry it might be incorrect and they completely miss the Y or something.   
Btw, I know they can only tell 2 girls if no y is found, but if a y is found it could be one of each or both boys. :)

Answer

I did a panorama and they only got 3.5% from each baby. They said both boys and it was true. I think there are only a few labs that do twins.