How to enable mic access for Revolut on iPhone if no option shows?

I had the same problem, turns out that Screen Time can block this completely. Make sure to quit the app, then go to your Screen Time settings "Settings>Screen Time> Content & Privacy Restrictions" and enable access to the microphone.

That done, the next time you open Revolut, it should again ask you for access to the Camera, then the Microphone should be enabled at the same time.

Took us weeks to figure this out, this is a really bad design for the microphone settings and could be improved A LOT. See I can't grant microphone access to apps. - Apple Community

Delete the app and reinstall it from the App Store.

If the microphone option doesn’t even appear in your iPhone’s Settings for Revolut (under Settings → Privacy & Security → Microphone), that means:

Revolut has never requested microphone access on your device. iOS devices only show apps in the Microphone list after they have explicitly asked for mic access at least once.

So what does this mean for you?

1. You haven’t triggered any feature that requires mic access.
2. The standard Revolut app (sending/receiving money, cards, trading, support chat, etc.) works perfectly fine without it.
3. Features like selfie video verification or in-app voice calls either:
   1. Haven’t been triggered on your device,
   2. Or they are not yet available in your country or app version.

See an example of Snapchat Download and install Procedure...