![Printable you are my sunshine poem](https://cdn2.cdnme.se/5447227/9-3/5_64e61dfa9606ee7f6350b87c.png)
Federation was working in the past in both directions. On-Prem user is able to federate with other companies and they can see our presence In the Username field, enter the domain (home) followed by a backslash () and your KU Online ID. Launch the app, and enter your primary KU email address sign in screen. On-Prem user is registered on O365, the domain is not registered for Skype for Business Online, users with O365 E3 licenses have the Skype for Business plan unticked. Install the official Skype for Business mobile app from the Apple App Store or the Google Play store. if the O365 Skype for Business Online user start a conversation an error message comes up "user is not using skype for business for a richer experience switch to Teams" if On-Prem users start the IM conversation IM works fine both ways O365 Skype for Business Online users cannot see the presence of On-Prem users (shows as Offline) or start an IM conversation
![o365 skype for business download o365 skype for business download](https://i.stack.imgur.com/AqLB6.png)
On-Prem user is able to see the presence and send IMs to O365 Skype for Business Online users On-Prem users uses Skype for Business on-premise server 2015 We have a very strange scenario with On-Prem to O365 federation.
![Printable you are my sunshine poem](https://cdn2.cdnme.se/5447227/9-3/5_64e61dfa9606ee7f6350b87c.png)