How to troubleshoot Invite participant Failed Message

Continuing the discussion from Calling someone into a conference call:

Today as the host, I was unable to invite participants into the conference using the invite icon via the computer. It comes up as a Failed message next to any phone numbers dialed. Does anyone know how to correct the problem. It started today. Last week I did not have this problem. Some participants were able to dial in with not problems.

Hello, this was a regression for several days. We fixed it few days ago. Sorry for inconvenience.
Eugene