That is usually the list of generic reasons they give if they changed the Recovery rebate credit on line 30. How much is on 1040 line 30?
Do you have an amount on 1040 line 30 for the Recovery rebate credit? Did you not get the 3rd Stimulus payment? Or qualify for more? Line 30 is only if you didn't get the full amount or qualify for more.
If the IRS thinks they sent it to you but you didn't get it request a trace for a missing third Stimulus payment
https://www.irs.gov/newsroom/questions-and-answers-about-the-third-economic-impact-payment-topic-j-p...
