Sending clean audio from a conference PA system to Zoom on an iPad for simultaneous interpretation

provide simultaneous interpretation for in-person conferences using Zoom's language interpretation feature. At each venue, I need to send the speaker's audio directly from the PA system or wireless microphone receiver to an iPad connected to Zoom, so that Zoom receives a clean audio feed instead of picking up ambient room noise through the iPad's built-in microphone.

I've used an original IK Multimedia iRig connected to the sound system's headphone output, and this setup used to work. Recently, however, Zoom has been picking up the iPad's internal microphone instead of the external audio.

I also have a Behringer UCA222 USB audio interface and an XLR-to-RCA cable. The iPad may have either a Lightning or USB-C connector, depending on the venue.

My questions:

• What is the simplest, most reliable way to feed the PA system's audio directly into Zoom on an iPad?

• Does Zoom on iPad reliably recognize USB audio interfaces such as the Behringer UCA222?

• Would it be better to connect directly to the wireless microphone receiver or to an appropriate output on the venue's mixer?

• Is there a known limitation or setting in Zoom for iPad that could explain why it is using the built-in microphone instead of the external input?

I need a practical, low-cost solution that can be set up independently at two venues hosting events simultaneously. Ideally, I'd like to use equipment I already own before buying anything else.

Thank you for any suggestions or tested setups!