IRS Notice CP11 says I owe Recovery Rebate Credit (RRC) Back!

My Adjusted Gross Income (AGI) was below $150K (married filed jointly) and still received an IRA Notice CP11 saying that I owe the RRC back ($1,400)! The notice even confirms my AGI as <$150K which matched Turbo Tax (TT) amount! I tried to call the IRS 800 number several times but due to call volume they tell you to call back later. I'll send a letter instead.

Is this a common issue that others have experienced?