Assistance Needed: Formly Radio Buttons Multi-Select Issue

Hey guys - Not sure if I'm missing something but I'd love some help on formly radio buttons - I did catch the caveat of adding the finsweet code to them - so all done there - however I'd like someone to be able to choose two or three options out of 7. But I can't seem to get a multi-select to happen - Any ideas on what I'm missing? Vimalan 🙏