duolingo is stupidly picky about using the correct apostrophe here; you may need to copy paste from some navajo sample text online
Yáʼátʼééh! The same problem appears in the word yá'át'ééh (when using the vertical apostrophe), so the exercise is marked as wrong. Instead, when it is not possible to use the curly (right closing single quotation) apostrophe, a space (or nothing) can be used. So, achoozhlaa / ach oozhlaa would be accepted, marking a typo. Anyways, I think it would be nice to accept the use of different apostrophes here. :)
Edit: I am only using the Multiling Keyboard on Android. I think the apostrophe can be typed as Alt+0146 on Windows, but I am not really sure of this. Sadly, the variations I have written above were rejected. Reported. ;)
I'm afraid that neither of the alternatives you mentioned worked for me either, after initially being marked wrong when using the apostrophe marks on my Engligh keyboard. On a previous lesson I had to go to Wiktionary to copy a letter 'i' that had both an acute accent and the nasalization mark below it before being able to complete the lesson.