Hi! We have come across this recently as well. Only information that we have gathered so far is the following:
"Pharmacies or Health Services that want to process HSA/FSA:
All companies that want to process any HSA/FSA must register with sig-is.org prior to being able to process any HSA or FSA cards. They will be limited in what they can run using anything that isn't specifically an FSA supporting POS. "
Best, Kevin (RITE)