It would work to put all DNs in the same pickup group, but it doesn't seem like it would be very useful. In this scenario, if you have multiple incoming calls and you choose to use call pickup, you would be connected to the earliest available call. Could you possibly use multiple pickup groups or hunt lists to accomplish what the client wants?
Are you getting this error “Installer User Interface Mode Not Supported. The installer cannot run in this UI mode. To specify the interface mode, use the -i command-line option, followed by the UI mode identifier. The value UI mode identifiers...
The below trick might come handy when you have to add a new node to a cluster but you don't have or is unsure of the security password for the publisher. This procedure has been around for ages.
1) Login into the CLI of the Publisher.