Symptoms
Consider the following scenario in a Microsoft Skype for Business Server 2019 environment or in a Skype for Business Server 2015 environment that has Skype for Business Server 2015 CU8 (January 2019 Cumulative Update) installed :
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User A is an enterprise user.
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User B is an anonymous user.
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The AllowParticipantControl parameter is set to True in the conferencing policy.
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The AllowExternalUserControl parameter is set to False in the conferencing policy.
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User B shares an application or desktop to User A.
In this scenario, User A can't request control of the shared application or desktop to User B.
Resolution
To fix this issue, install one of the following updates:
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For Skype for Business Server 2019, install the December 2019 cumulative update 7.0.2046.151 for Skype for Business Server 2019, Enterprise Web App.
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For Skype for Business Server 2015, install the July 2019 cumulative update 6.0.9319.559 for Skype for Business Server 2015, Enterprise Web App.
