You will do nothing to make up for the FICA taxes that were not assessed on the excess HSA contributions. In this case, the FICA taxes that were not collected on the contributions are never collected, even if the contributions are found to be in excess.
"I will be reporting those excess contributions as "other income" on my 1040, so that they can be appropriately taxed." I can't be sure, but I want to emphasize that you should not do anything to add the excess contributions to Other Income - TurboTax will do this automatically for any excess contributions that came through your employer (code W in box 12 on your W-2).
TurboTax will handle everything, except, of course, actually contacting your HSA custodian (which you have apparently already done)
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