When a non-admin user is importing into a constituent update batch that has constituent sites marked as required and the field mapped in the import process, they may receive Error: No results for field "Site" using search list "Site Search" were found. 'Constituents sites' is required. This occurs even though a valid value is included in the import file. This issue does not occur for System Administrator users.
Download and install the latest version and patch, if applicable.
Workaround: Uncheck Constituent Sites as being required in the batch template.