Manual completion of failed RMAN duplicate

Controlfile creation failed (Phase 2)
- ** The restore has completed - Db dest is nomount **

- Failed to create controlfile because wrong destination instance name:
...
duplicate target database to p2 nofilenamecheck;
...

No need to backup controlfile to trace as suggested in note.
Go to rman log and copy and paste the failed statement (with your corrections)

Controlfile created, recover (Phase 3)
- ** Db dest is mounted **

Suggested script in note is uncomplete because lacks auxiliary channel allocation.
Be sure to keep the same until time.
Here it is with advanced legato channel configuration:

run { 
  set until time "to_date('06-28-2007 00:00:00','MM-DD-YYYY HH24:MI:SS')";
  allocate auxiliary channel t1 type 'SBT_TAPE' parms 'ENV=(NSR_BINDIR=/usr/sbin,NSR_CLIENT=pkg_nis,NSR_SERVER=bk801bck,NSR_DATA_VOLUME_POOL=DBTAN)';
  recover clone database; 
  alter clone database open resetlogs; 
}