According to the IRS FAQs here:
To ensure the information is entered correctly, please use the help tips provided when entering the information requested to verify your identity. If the information you enter does not match our records, you will receive an error message. Check the information requested to ensure you entered it accurately.
You may want to check your most recent tax return or consider if there is a different way to enter your street address (for example, 123 N Main St vs 123 North Main St).
If you receive an error when entering your Adjusted Gross Income (AGI), refund amount, or amount you owed, make sure you are entering the numbers exactly as they appear on your Form 1040 or tax transcript. If the numbers from your 2019 tax return are not accepted, try the numbers from your 2018 tax return instead.
If the information you enter does not match our records three times within 24 hours, you will be locked out of Get My Payment for 24 hours for security reasons. You will be able to access the application again after 24 hours. There is no need to contact the IRS.
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