@jurrinus
Comments/Suggestions:
1) The AGI must be from the original accepted e-file that you submitted last year, so if you made any amendments, you can't use the later amended AGI...only the original one. Look at your PDF of last year's first-filed tax return, and use line 7 of the 2018 form 1040.
2) If you filed last year late...on paper thru the mail try an AGI of zero . (You did say you e-filed last year though....try a zero anyhow).
3) last name two words.....same two-words as last year shouldn't cause a problem as long as they were entered the same way ..... but who knows what "improvements" they've made to name formats since last year.
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Other than that...switch to file-by mail and take it to the Post Office.
You said you can't, but didn't say why...you have until 15 July. You should be abler to find a way...somehow...unless living in, say, Kazakhstan....but even there there are US embassies/consulates tah might provide a means for mailing.
____________*Answers are correct to the best of my knowledge when posted, but should not be considered to be legal or official tax advice.*
