cannot beam

Hi, I am fairly new to Musescore. Coming from using Logic Pro, I have to change many ways of my thinking to try to use Musescore effective. Many problems I have encountered I have resolved by reading the many helpful posts, however, with the current problem, for hours I just cannot get Beaming to work as intended:

in bar 5 of the attached score, on beat 3 and 4, there are supposed to be two voicings. I am simply trying to beam the "lower" voicing notes together as in the original score(I am preparing demo tracks for our local choir). Yet nothing seems to work. I have tried dragging the various beaming icons to the notes, highlighting the notes and double clicking on the various beaming icons...etc.

Suggestions would be most appreciated!