ORA-11414
An active per PDB Data Guard is running on another instance.
Cause
The PDB could not be opened because another instance in the Oracle RAC has the same PDB open with recovery running. Only one Oracle RAC instance may have a standby PDB open with managed recovery running.
Action
If managed recovery needs to be running and the PDB needs to be open on this instance then cancel managed recovery, close the PDB on the other instance and then open it on this instance and start managed recovery. If the PDB needs to be open on more than one instance then cancel managed recovery and open it.