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DAG / Activating database on different node failed

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Dear all,

We have (5) exchange servers to our infrastructure. Two of them they are just client access (one on the pr/one on the dr). The other 3 servers are mailbox servers. I am trying to activate the database on the first exchange server using ECP and i am getting the following message: 

<label style="font-weight:bold;">ERROR</label>
Mailbox DB01
An Active Manager operation failed. Error: The database action failed. Error: An error occurred while trying to validate the specified database copy for possible activation. Error: prexc1: Database copy 'Mailbox DB01' on Server 'prexc1' component (HighAvailability) state is offline. If you need to activate this copy of the database, you can use Set-ServerComponentState -Component 'HighAvailability' -Status 'Active' and retry Move-ActiveMailboxDatabase. [Database: Mailbox DB01, Server: PREXC2.....

The database now is mounted on PREXC2 and i want to activate it on PREXC1.

Any ideas?


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