Publishing to Word Doc doesn't work in Storyline 360

I had this same issue. In my case, after I closed Storyline, I saw a Microsoft dialog box asking me to sign in to my Microsoft account. I signed in, but the resulting document was missing screen shots.

So I opened Storyline 360 again and tried to republish. It hung up again. I opened Task Manager (because I couldn't minimize Storyline to see what else was on the screen) and selected Microsoft Word. That displayed the Microsoft sign-in box again. I signed in to my account and then Storyline completed the publishing process.

I publish to Word frequently. This was the first time this ever happened. (Edit: Looking at this further, it appears to have occurred because Word wasn't sure if it should use my personal OneDrive account or my work OneDrive account.)