For LDAP and database sources, the multi-valued input parameters are not supported in the attribute source. If you input a multi-valued parameter, only one value is picked for the calculation.
You cannot use the existing Identity server user stores directly as an attribute source. You must create a separate data source to use the user stores.
You cannot edit or store any attribute value permanently in the existing LDAP attributes, shared secret attributes, or external database by using virtual attributes.
SSL communication with SQL and Oracle databases that are used by virtual attributes (data sources) is not supported.