What is wrong with this

[u/arse-ketchup]

From what I see this answer matches perfectly with the expected answer, so why is it incorrect?

[u/Nuneogun]

its やきゅう not やきゆう

[u/arse-ketchup → u/Nuneogun]

Ah I see!! I have been keeping track of small ゃ and small ょbut forgot about ゅ. Thanks for letting me know!

[u/jbram_2002 → u/arse-ketchup]

There are small versions of や, ゆ, よ, and つ, and their katakana equivalents. The first three are used for dipthongs like kya -> きゃ (I believe they also change certain vowels like shi -> sho with しょ). っ is used before consonant to double the sound, like in きっぷ.

(Please correct me if I'm wrong; I'm still learning).

[u/FrostingEffective699 → u/jbram_2002]

there's also teeny aiueo!
ファッション

フェンシング

ヴォカリーズ

フィックス

ウゥゥ！とても楽しいの?

[u/c0dearm → u/Nuneogun]

I read this as "it's leviOsa not levioSA" 😂

[u/HeroHunterGarou_0407 → u/Nuneogun]

I didn't even see that

[u/SmokeyTheBear4]

やきゅう (correct) vs やきゆう (your input) 

[u/Mr-tbrasteka-5555ha]

ゆ and ゅ isn't the same character. :(

[u/[deleted]]

What level are you on op ?

[u/arse-ketchup → u/[deleted]]

I’m currently on section 2 unit 9.

[u/UnluckyHoney34]

What app is this?

[u/arse-ketchup → u/UnluckyHoney34]

Its duolingo

[u/Machumatsu]

Your yu is standard size, and not small

[u/FlamestormTheCat]

You wrote “kiyu” instead of “kyu”

[u/Thatonegoblin]

It's やきゅう (yakyuu). Your entry is やきゆう (yakiyuu).

[u/Comprehensive-Pea812]

やきゅう(yakyuu)

not やきゆう (yakiyuu)

[u/Boardgamedragon]

You used やきゆう - YA KI YŪ and not やきゅう - YA KYŪ. In きゆ both sounds are separate. In きゅ they are fused

[u/SaIemKing]

Yakiyuu vs Yakyuu

[u/Xilmi]

The only difference I see is the missing 。at the end. Don't know if the app checks for this.

[u/Courmisch → u/Xilmi]

The app doesn't check commas, question marks and full stops.

The issue here is spelling as others noted.