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@Ln_98  Did you get a letter from the IRS?  

That might be the list of generic reasons they give if they changed the Recovery rebate credit on line 30.  How much is on 1040 line 30?

 

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.  The IRS shows they already sent it to you.