Event ID - 8206

Event Id8206
Description There was a failure during shutdown of the Microsoft Exchange Conference Management service. There were problems communicating with the Service Control Manager. Error code: 6; Message: The handle is invalid.
Event InformationCAUSE:
This behavior occurs because the hostname of the conferencing server has been changed.
To resolve this issue, you can change the hostname of the conferencing server back to its original name or change the hostname of a conferencing server within the Active Directory for the Conferencing service.
Reference LinksExchange Conferencing Service Configuration Not Found in the Active Directory

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