Sharepoint 2013 Workflow Manager Disaster Recovery Certificate problem

We want to restore a backup of our productive Sharepoint 2013 environment with all currently running Workflows on a new Sharepoint server. We found these manuals for ‘Workflow Manager Disaster Recovery’.

http://ift.tt/1DFwaXt

http://ift.tt/1qClYc8

What we already did:

• restored the needed databases (WFResourceManagementDB, WFInstanceManagementDB, SBGatewayDatabase, SBMessageContainer)


• executed the cmdlets

1. Restore-SBFarm


2. Restore-SBMessageContainer


3. Restore-SBGateway


4. Add-SBHost


5. Restore-WFFarm (FAILED!)
   
   Token provider returned message: ‘400The namespace ‘WorkflowDefaultNamespace’ does not have a valid issuer that can be used to issue tokens. Add a valid issuer with a valid signature to the namespace.

In the manuals we read, that we have to import the ServiceBus certificate from our productive environment. But we can’t find that certificate. With get-SBFarm we got the thumbprint, but there is no certificate on the server with that thumbprint.

Can anyone help? Is there maybe another way to do this?