Why would I get this notice letter after entering a person's HSA contribution

"The deductible contribution to your Health Savings Account for 2021 is $2,150. To ensure that your contribution is allowable, $2,150 must bedeposited to your account on or before April 18, 2022."

Could I be entering the info incorrectly? 

I took the figure from Box 2 of Form 5498-SA and entered it into Form 8889 2nd box under 'Contributions and Deductions'