Message Oracle DGM-16979 - Unable to log on to the primary or standby database as SYSDBA

ERRORUnable to log on to the primary or standby database as SYSDBA
CAUSEThe username/password used by the observer to log on to the primary database and Fast-Start Failover target standby database does not have valid SYSDBA credentials.
ACTIONMake sure the primary database and Fast-start failover target database are using a remote login password file. Make sure the SYSDBA password is the same at both databases and that the SYSDBA password is used in the CONNECT command. Start the observer again.