After you install DR backup agent on the Hyper-V host, it gets into the Waiting for pairing state, and waits 24 hours to receive the settings (password and port) from Backup & Disaster Recovery appliance to establish connection.
To establish connection between the DR backup agent on the Hyper-V host and appliance:
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In the appliance Management Console, go to Clients › Edit.
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Find and select the client created for the Hyper-V host.
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In the General group, click Push Client Settings.
The backup agent will receive the settings from appliance and get into the Paired state.