I'm not sure this pronunciation is correct, I'm going to report it. http://www.abair.tcd.ie/?synth=hts&lang=gle&page=synthesis&submit=true&view=listen&xpos=&ypos=&speed=Gnáthluas&pitch=1.0&colors=default
Well, the school was in Munster perhaps that may have had something to do with it. I have to say that the pronunciation in this the program, while lovely to hear, is relatively foreign to my ear with a heavy northern emphasis. Quite clipped at times and not as broad as I was used to. Eg chat sounds like cut not more like caught but there you go.
Clearly you're not based in Ireland. There is very little "active interest" in Ulster Irish in the fastest-growing sector of Irish language usage (the Gaelscoileanna and urban Irish generally), and even in Ulster, Belfast Irish is a bit more Caighdeánach than Donegal Irish. The view from thar lear is often tainted by out of date politics, though.
The English sentence which was presented was. 'They are proud of you.' In my first Irish sentence choice, from the word bank, was ... 'Tá siad bródúil asaibh' This was scored as an error and the end word displayed as 'asat' in the correct answer sentence. The next time it came up I changed the end word to the one suggested as correct. This sentence was scored as incorrect and my original choice of 'asaibh' put in at the end of the 'Correct' sentence. So I answered the translation twice and both times it was scored as incorrectrven though I changed the end wird as I just described. The third time it was presented I used my original end word and it was scored as correct. So the same sebtence with exactly the same words in the same order was scored as correct abd incorrect in the same lesson. And a sentence presented as correct was subsequently scored as incorrect. You can see my confusion and I have to say my confidence in Duolingo has been undermined.
I don't know how Duolingo puts together those "word bank" exercises, but the necessary words are always in the word bank. If your word bank included both asat and asaibh, but only accepted one of them, then all you can do is use the "Report" flag to report the issue. Sentence Discussions are a user-to-user forum, they aren't read or monitored by Duolingo staff, and aren't a channel for reporting issues.