Zoom can't use external audio device on iOS.

[Zooooom]

It seems impossible to use an external audio device with Zoom on iOS. All other apps like youtube or spotify use it without any problems.

[Jameswalter]

Make sure your mic is connected and turned on. If using an external mic, examine the connecting cable, or check your Bluetooth settings if using a wireless mic. For wired mics, try plugging it into a different USB port. For Bluetooth devices, make sure the battery is charged.

Select Join Audio. Zoom usually requests access to your mic before you join a meeting, but in case you missed it, you can select Join Audio at the bottom of the Zoom window.

Make sure you're not muted in Zoom. If the microphone icon has a line through it in your Zoom window, select the Sound icon to unmute yourself.

Make sure your microphone is selected in Zoom. During a meeting, select the up arrow next to the Microphone icon and make sure the desired mic is chosen.

Regards,
James

[Zooooom]

James, thank you for your reply! However, the audio device I wanted to use was to only just listen to the meeting via line-out, although it does indeed have a microphone port that I didn't plug in. I couldn't switch to the device for audio output with the speaker-icon when connected.