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Symptoms

You set the EnableExternalAccessCheckparameter to True and set the EnableOutsideAccessparameter as False in Microsoft Skype for Business Server 2015. In this scenario, a Skype for Business on Mac user can’t make a peer-to-peer (P2P) call or join a conference. This issue only occurs after you install the July 2018 cumulative update for Skype for Business Server 2015 (CU7).


This issue also occurs in Skype for Business Server 2019.

Resolution

To fix this issue, install one of the following updates:

Workaround

To work around this issue, you can enable the EnableOutsideAccess parameter in an external access policy or disable the EnableExternalAccessCheck parameter in a platform service settings configuration.

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