if 0 doesn't work one other option is to get an account transcript of your 2019 return from the IRS to check your AGI. in most cases it'll be what you have. if that's the case, for some reasoneven those entering the correct AGI can't e-file. that leaves mailing it in.
https://sa.www4.irs.gov/eauth/pub/login.jsp?Data=VGFyZ2V0TG9BPUY%253D&TYPE=33554433&REALMOID=06-000e...
or start here
https://www.irs.gov/individuals/get-transcript
