To fix this issue, install one of the following updates:
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For Skype for business 2016, install the June 4, 2019, update (KB4464576).
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For Skype for Business 2015 (Lync 2013), install the June 4, 2019, update (KB4464593).
Note Lync 2013 was upgraded to Skype for Business in April 2015.
