To Add to my post above:
Social security number (SSN). Be sure to enter the taxpayer's SSN in the space provided on Form 8453. If a joint tax return, list the SSNs in the same order as the first names.
Payments
Do not attach a payment to Form 8453. Instead, mail it by April 18, 2022, with Form 1040-V to the IRS at the applicable address shown on that form. If a Form 1040-V is not available, see the instructions for your tax return for other ways to get forms or you can go to IRS.gov.
Form 2848. An electronically transmitted return signed by an agent must have a power of attorney attached to Form 8453 that specifically authorizes the agent to sign the return.
