First step is to reboot everything involved.... Phone, tivos and all networking equipment involved.
Then try signing out and back into the app.
If that doesnt help:
What IOS device? What version IOS? What version of the app? What model Roamio? What version of Tivo software is running on your boxes? How are all of your Tivos connected, network-wise to each other and the internet? Static or dynamic IP? What do you mean by "look at anything"? To like manage your tivo by looking at your to-do list or guide, or to like stream shows?
-Roamio Pro/Slide Pro
-Stream (Gotta go unplug the sucker one of these days!)