Open Skype for Business. When prompted, tap the arrow, then tap OK on the introduction page.
You may get an error after entering your Login name. To continue signing in, select OK.
In the Password field, enter your Identikey password, then tap Sign In. You can choose to have the app remember your password when you use it going forward.
Fill in your phone number and tap the arrow to continue.
The Skype for Business homescreen will appear when you're successfully signed in.