The IRS will also now reject 5405 that doesn't include a payment. If you haven't yet tried to submit your return without the form, I suggest doing so.
If your return is rejected for not having the form attached, the only remedy is to file by mail.
Sometimes you can reach the IRS special hotline for this credit to have them remove the requirement, but often it does not fully update until the next tax year. That number, as well as the lookup site (which verifies the credit is still tied to your Social Security number), can be found HERE.
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