Query not showing in dba_hist_active_sess_history
Afer checking that you are indeed on the correct database and if ASH- and AWR reports for both instances don't show any long running queries it's time to get in touch with your application developers. Try to find out which statement exactly is slown and why.

I had similiar issues with various applications and application environments and issues I encountered where


jdbc:thin behaviour different form jdbc:oci
issues with different ojdbc driver versions
code changes that split a transaction in multiple small connections resulting in the database doing nothing but opening and closing connections
configuration issues with connection pools


So you might have to look in different locations.