Now the archive which is it asking is the first archive that was generated in the DB.
SQL> recover standby database; ORA-00279: change 10505773008414 generated at needed for thread 1 ORA-00289: suggestion : /archive/oracle/1_1_718997430.dbf ORA-00280: change 10505773008414 for thread 1 is in sequence #1
this gave me a checkpoint_change# which was way beyond the expected. so i brought that particular datafile from prod and restored on BCP. it worked.
select to_char( CHECKPOINT_CHANGE#),FILE# from v$datafile_header order by 1 desc;