Q: Is it permissible to make dua in Sujood during the salaah? Also, does this dua have to be in Arabic or can it be in any language? I have heard that if dua is made in any other language other than Arabic in sujood during the salaah, then the Salaah is not valid. Is this correct?
A: Yes, it is permissible. It should be in Arabic.
It is makrooh to do so.
And Allah Ta’ala (الله تعالى) knows best.