ZetaDocs Express sign-in issue with O365 and ADFS

Hi, I'm having trouble signing into ZetaDocs Express with my domain user login. My user account is federated with 0365. I have successfully logged in by creating a new user account in O365 that is not federated with our on-premise domain. That works fine. I've also tried another work around using an application specific password, which also works fine. SO I have 2 successful work around, but if I go and login at my colleagues desk ZetaDocs won't just work, I'll need to do some configuring. Does ZetaDocs express not support ADFS, or do I need to adjust a setting somewhere. Thanks Chris