Turbotax can't help. It knows nothing bout this and has no access if you need to provide documentation. the best option is to call. a mailed letter can take over 5 days to reach the iRS.
if there;'s a number on the notice call that number. Otherwise,
Call 800-829-1040
1) Choose your language,
2) Then choose option 2
3) Then 1
4) Then 3
5) Then 2
6) When it asks you to enter your SSN or EIN do nothing – wait - - After it asks twice, you will get another menu
7) Then 2
😎 Then 3
It should then transfer you to an agent. Note when its phone line are busy you may be on hold for a long while or disconnected
you can also try to access your tax return transcript to see what it shows but that requires you to have or set up an ID.me account.
https://sa.www4.irs.gov/sso/?resumePath=%2Fas%2F01TZo1nwBO%2Fresume%2Fas%2Fauthorization.ping&allowI...
