An amended 2020 return has to be sent in by mail---it cannot be e-filed. Only some paid tax preparers are still able to e-file amended 2020 returns using their professional tax software. You need to print, sign and mail your own 2020 1040X.
Even during “normal” times it takes about four months for the IRS to process an amended return. During the pandemic and due to the severe backlog at the IRS it is taking much longer—six to nine months or more for many amended returns. Do not expect quick results from amending. When the IRS issues a refund for an amended return it will be by check. They do not make direct deposits for refunds for amended returns. You can watch for information here:
Did you amend the 2020 tax return using the TurboTax desktop editions for tax year 2020?
To amend a 2020 return that was completed using the 2020 online editions, the Amend option shows that you need to use the 2020 desktop edition -