Hi,
Is that happen to specific MAC?
How about windows, is that the same issue?
For this issue, please try to re-install the SFB web app plug in, then test again, please refer to the document below
https://blogs.technet.microsoft.com/reinstall_lwa_plugin_in_macos/2014/04/07/how-to-re-install-lync-web-app-plugin-in-a-mac-os/
Best Regards,
Alice Wang
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