I have used the translation "Bahasa Indonesia dipahami oleh banyak orang di sana.", and it was rejected. I have made a report to be added.

Sentence suggested by Duolingo:

Bahasa Indonesia dipahami banyak orang di sana.

The translation for "understood" / "dipahami" is lacking. Reported.

Hints suggested for "by":

• pada
• dekat
• paling lambat

The translation "oleh" is lacking. Reported.