Hello,

I am a US citizen living and working in Germany. I filed my 2020 income tax recently and received the letter 5071C. I called the hotline on the letter to no avail. I tried idverify.irs.gov but cannot get through personal info step because all my addresses come up as invalid. I tried all my addresses since 2010 but nothing worked. Can you suggest what I should do? Or can you or someone you know represent me on this? Thank you!