I didn't have a typo recognised is recognized by those not in the US
I noticed that too!
The real mistake here is the stars and stripes to represent English
Agreed, "recognised" (UK spelling) is not a "typo".
Is “aku” the root of “diakui”? Like with German “das Ich”?
There is no 'z' (pronounced zed) in recognised.....
My understanding is that if the object immediately follows the verb, "oleh" is not needed, so I wrote "Gelar kamu tidak diakui mereka." but it was not accepted. Am I wrong?
No, you can add oleh to passive voice, or you can throw it away.