What if I need an additional flex debit card? Crystal December 02, 2022 14:10 Updated Contact Optum Financial at 866.600.4984. Find more FSA-related FAQs here: https://www.optumbank.com/tennessee/customer-support/faqs/fsa-faqs.html. Related articles Who manages the flexible spending accounts? Which flexible spending accounts have a debit card to use? Can I change my flexible spending contribution amount during the middle of the plan year? Why am I being asked to provide evidence of a claim or an EOB from my insurance because I used my FSA or L-FSA debit card? Can anyone enroll in the flex benefits?