Symptoms
Assume that you're in a team call group in Microsoft Skype for Business 2016 or Skype for Business 2015 (Lync 2013). You receive a team call, and you answer the call. When you try to transfer the call to a team member by clicking the Transfer button, the call can't be transferred.
Resolution
To fix this issue, install one of the following updates:
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For Skype for Business 2016, install the August 7, 2018, update (KB4032255).
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For Skype for Business 2015 (Lync 2013), install the September 4, 2018, update (KB4092457).
Note Lync 2013 was upgraded to Skype for Business in April 2015.