Symptoms
Consider the following scenario:
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User A starts a call with User B in Microsoft Skype for Business 2016 and User B accepts the call.
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User A tries to transfer the call to User C who is offline.
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If User C doesn't accept the call, User A receives a "Cannot complete the transfer" error notification.
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User A clicks the error notification to see the error's details.
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The error's details shows "Call was not transferred because User A cannot be reached and may be offline."
In this scenario, User C should be shown in the error's details.
Resolution
To fix this issue, install the February 6, 2018, update (KB4011662) for Skype for Business 2016.