“Cancel” a non-funded Riester payment after a rejected allowance application

Hello community! I took a sabbatical last year after the end of an employment contract. Unfortunately, at the end of 2025, I transferred the annual Riester contribution as usual and did not take into account that without paying into the statutory pension insurance, I would receive neither the allowance nor the tax advantages for the year. Today I received a letter from the ZfA informing me that I was not a beneficiary due to the pension insurance problem