Getting error FRM-93380: unexpected error while attempting to redirect to Oracle Access Manager

We are using OID to store RADs. I go into EM Forms Runtime LDAP Associations. If I leave Primary Identity Store unchecked, it uses OPSS for RADs and I can authenticate and get into my Forms application. If I check Primary Identity Store, I get error FRM-93380: unexpected error while attempting to redirect to Oracle Access Manager. ldapbind works from the Forms server to the OID server.

I can't figure out why OID authentication isn't working.