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RMAN duplicate fails with ORA-29760: instance_number parameter not specified

I'm trying to duplicate a RAC database to a different cluster using the methods that do not require connecting to the target database or an RMAN catalog. This is for auditing purposes to "prove" our backup and restore processes work.

I'm following the documents 874352.1 and 1375864.1. However so far I've not been able to get past the point where rman does the first shutdown/startup of the target.  I believe it's failing to restart the target instance. I was hoping someone here could point me in the right direction since my searches haven't found the solution yet and we all know how painful SRs can be.

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