I can never login – Yammer Review

I have an iPhone 6 s I downloaded the app excited to ease the login process off of my phone browser. However every time I try to login it says I don't have Internet connection :-( have no problem with login from browsers both on phone and home computer. Yammer app won't do it. Bummer. Also no help line to ask for assistance without paying a fee. My brother has an iPhone 5 and it works fine. The app is great only on certain phones.
Review by Aspen ape on Yammer.