Hb and wife both have W-2 income and received a CP05A notice. They have a refund for 2020 of around 3K. IRS won't release the refund until they send in additional information about their income. The IRS is asking them to fax pay stubs on employer letterhead. IRS has their W-2s and both have been employed by the same employers for years. Why would the IRS be asking for pay stubs?