You may need a copy of your 2018 and 2019 return.
This link will help you with your 2018 return and how to get a copy: https://ttlc.intuit.com/community/prior-year-return/help/how-do-i-get-a-copy-of-the-return-i-filed-i...
Also, to print a copy of your 2019 tax return, please follow the steps in the below TurboTax FAQ:
https://ttlc.intuit.com/community/prior-year-return/help/how-do-i-get-a-copy-of-a-return-i-filed-thi...
How long the verifcaiton process takes is completly unknown and depends on the IRS. You will need to contact the IRS for questions relating to the process timeframe: How do I contact the Internal Revenue Service (IRS... - Community
Why do I have to validate?
The IRS often examines returns when certain indicators pop up to be sure it's really you filing the return and not tax fraud or ID theft.
"Accepted" is merely referring to an efile status. It means your efiled return was formatted correctly with the basic requirements to meet the IRS specifications so that they could agree to start processing. During processing if something came up, they might ask you to verify ID.
*this is a question you can ask the IRS upon contacting them directly, since the reason is based upon your indiviual return.
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