Can QuantSeq Flex libraries be dual indexed?

Provided that the recommended partial adapter sequences are included on target-specific primers, Lexogen’s 12 nt Unique Dual Indexing Add-on Kits (UDIs) or i5 6 nt Dual Indexing Add-on Kits can be used for dual indexing QuantSeq-Flex libraries.

See these FAQs for further information on dual indexing strategies:

Which 6nt i5 Dual Indexing Add-on Kit do I need?archived
12 nt Unique Dual Indexing Solutionsarchived