Tuition reimbursement overpayment

Hello, I have a quick question. I owed a total of around 1923 of tuition reimbursement for 2023 at now my former employer . I recently left at the end of 2024 and they never took the balance as I asked them to (so frustrating ). At any rate, I will be cutting them a check of a remaining balance of around 600+ dollars to satisfy the remaining balance, bearing in mind the total original amount was tax free . So, since we are nearing the end of 2024 taxes, will I incur any penalties once the correct the 2023 taxes or, since the amount was less than 3000 so I need to amend 2023 taxes ? I’m so frustrated with this former employer . Truly all of this was so unnecessary if they actually did what I asked them to do originally.