I had to re-file my 2020 federal taxes by mail after the IRS rejected my e-filing with TT.  The IRS thought there might be a duplicate 1099-R listed on my return. There was not a duplicate 1099-R, so I didn't change anything on my return, which meant that I had to re-file it by mail.  I sent in my 1040-SR along with a payment voucher and check for taxes owed.  That check cleared the bank about a week later, so I assumed my return was accepted. Now, 8 months later, I just received a Notice CP80 from the IRS saying that they had credited the taxes owed to my tax account, but did not receive my tax return.  The instructions said to send "a newly-signed copy" and "be sure to attach copies of all schedules and other documents you included with the original return." Question #1 - do I include the original notice that my e-file was rejected and why, or would that just open up a new can of worms? and, Question #2 - I have since made quarterly Estimated Taxes this past year. Those amounts do not show up in my tax account, just the original taxes owed for 2020. Should I inquire about those now, or wait until this lost tax return issue is resolved? (I hate to 'poke the bear'  😬)