Attempting to mount Exchange Server 2016 DAG database with 1 of 2 nodes down throws the error: “Error: An Active Manager operation failed. Error: An Active Manager operation encountered an error. To perform this operation, the server must be a member of a database availability group, and the database availability group must have quorum. Error: Automount consensus not reached (Reason: ConcensusUnanimity does not allow auto mount. (IsAllNodesUp: False)).”
Problem You have two Exchange 2016 mailbox servers configured as a DAG and one server providing witness servers. One of the mailbox server experiences an issue and goes down so the remaining mailbox server continues