Hi Onur Ka,
Based on my research, it is a known issue, if you have following scenario, you may face this issue:
•
You have the Microsoft Skype for Business 2016 MSI client installed.
•
You have the October 2, 2018(KB4092445) update or a later update installed (.exe file version 16.0.4756.1000 or a later version).
•
You send or receive an IM that contains an emoticon or emoji.
This issue occurs because of a missing prerequisite update, to resolve this issue, you need to install the following office update:
October 2, 2018, update for Office 2016 (KB4011669).
You could refer to the official document to find the details about this:
Skype for Business 2016 MSI client doesn’t display emoticons or emojis.
Best Regards,
Evan Jiang
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