Hi Scot1970,
Do you use Skype for Business on-premise environment or Online?
Are you the organizer or attendees, did other attendees in the meeting have the same problem?
Did it happen with other meetings, or just this specific one?
If using on-premise server, do you know which type of meeting when creating? (As below)
According your description, I think it seems be related to policy.
Please check the client policy and conference policy, make sure the “AllowIPAudio”, “AllowIPVideo” is enabled.
In addition, try to clear the user sip cache under %useprofile%\AppData\Local\Microsoft\Office\1x.0\Lync\sip_xxx, and re-login to see the result.
Best Regards,
Shaw Lu
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