All of these Codes indicate a review/examination of the EIC and Child Tax Credit. This does not necessarily mean you are going to be audited. You may not even receive a response and end up getting your full refund as filed or it may be adjusted or offset. During this time period, the IRS was reviewing EIC and Child Tax Credits. IRS Transaction Codes
For 2021 returns any return with EIC or Child Tax Credit was going to be delayed and the IRS would not begin issuing refunds until about March 1, 2021. IRS Refund Release EIC and CTC
