What you could do while your protected return is being reviewed is delete the HSA forms (8889 and 1099-SA) and step through the section, and the HDHP section again. This is where errors most often occur. If you had a 'Family' plan, be sure to indicate 'None' for your spouse.
If you know you didn't over-contribute, check your W-2 entry again. It's a good idea to clear your Cache and Cookies after deleting, before re-entering.
Here's more info on Excess HSA Contribution.
@Bgmarswat1
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