Water material is rendering as white

Hello.

Many of my students are having a hard time rendering water and ice cubes as transparent in Adobe Dimension. I had them try to edit the opacity, the translucency, and edit it in Photoshop, but nothing has been successful. 

I cannot find any tutorials or information on this problem because I cannot find anyoner having this issue.

Please assist! This is a very urgent issue because tomorrow is the last day of class! 

I attached students work before and after rendering. 

Thank you!