Ineligible for PIN: The spouse reported is under the age of 16 and has never filed a tax return. This rejection is typically in conjunction with rejection code R0000-503 but not always. It means that you did not enter the correct prior year Adjusted Gross Income (AGI) amount for your spouse.
Fix #1: Sign into your RapidTax account and double check the amount you entered. Update from your rejection status page if incorrect.
Fix #2: If the amount seems correct to the best of your knowledge, you may need to paperfile your tax return for the year.