Cannot record voice on Final Cut Pro with external mic

I want to record a voice over using my external device, a REM USB Fireface UCX interface. The interface itself is working fine and I use it all the time for recording into Logic Pro.

In FCP when I go make a voice recording it works fine if I choose the inbuilt mic. I am able to choose the Fireface, it is obviously recognised as it shows in the list. However since a few days when I click on the red button nothing happens. I did some recording last week and it worked fine, i.e. after clicking the button I get the countdown and record audio. But when I tried today nothing, no countdown.

I double checked it is still working fine in Logic.

The same issue happens if I make the Fireface the audio input in sound settings, then choose "System" in FCP.

To summarise

• FCP recognises the device but will not record. (no countdown)
• Logic records fine
• FCP worked until today, there have been no updates recently, nothing has changed on the system

Anyone please help? Thanks