Hi There,
I didn't know this before about Workflow Manager (although had this idea about Service Bus) that Workflow Manager do not support the Workflow Manager farm in even numbers. You can have 1 or 3 Workflow Manager servers not 2 or 4. Workflow Manager farm only works with odd number of servers in the farm. I believe this is due to Service Bus limitations. See references for more.
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Workflow Manager Supports Odd Servers Farm SharePoint 2013
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Oleh
Fury