Learn French: Leur vote a été unanime, ils ont rejeté la candidature. - Their vote was unanimous, they rejected the application.

You would place it between the auxiliary verb (ont) and the past participle (rejeté), making it: ils ont tous rejeté la candidature. Because tous acts as an independent pronoun here meaning 'all of them', you must clearly pronounce its final 's'.

Why is it singular Leur vote if multiple people (ils) are voting?

French often uses the singular when a group shares a single abstract concept or produces a single collective result. Here, the group reached one joint decision, so it is Leur vote. If the speaker were focusing on the individual ballots cast by each person, they would use Leurs votes.

Could I use the word application instead of candidature here?

No, application is a false friend in this context. In French, une application refers to a mobile app, software, or the physical application of a substance or rule. When referring to applying for a job, a program, or a political position, you must use une candidature.

How do you pronounce the beginning of unanime?

Unlike the word un on its own, there is no nasal vowel here. Because the first 'n' is immediately followed by a vowel ('a'), it breaks the nasalization. It is pronounced 'u-na-nim', with a clear 'n' sound starting the second syllable.