If there is nothing on Line 30, you are not taking the Recovery Rebate, so the IRS is not going to have an issue with not claiming the credit. Are you sure you are not referencing Letters 6419? The 6419 refers to Advance Child Tax Credit payments - those are entered in a different place (Child Tax Credit section).
You should have Form 8812 included with your return. Check Line 14f - it will show any advance payments you received from the 6419 letters.
IRS Letters 6419 and 6475 for the Advance Child Tax Credit and Third Stimulus: What You Need to Know
@JimM1590
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