What Form 8821 does (and does not do)
irs.gov says Form 8821 authorizes any individual, corporation, firm, organization or partnership you designate to inspect and/or receive your confidential information, verbally or in writing, for the type of tax and the years or periods listed on the form. The form itself says not to use it to request copies of your tax returns or to authorize someone to represent you. The form is also used to delete or revoke earlier tax information authorizations.