Lightning to USB camera adapter stopped working after update to iOS 26

For the past years I have been using a iPhone 12 Mini together with a Lightning-to-USB camera adapter (Original Apple) alongside with a sound card (TC Helicon Play Acoustic Live) to record the audio output of my live music shows. It worked perfectly fine. Reliably with great sound quality.

That was until iOS26.

Now, my sound card is recognised in some apps - which SEE the device and name it correctly - but can't seem to access the audio stream any more, so either crash or not work at all! Any attempts to record result in crashes. I have used multiple audio tools trying to record:

• Apple Camera - in video mode: focuses and defocuses every second.
• Recorder - "ERROR. The operation couldn't be completed. (PCMRecorder.PCMError error 1.)"
• Ferrite - names device correctly. No signal when starting recording.
• Blackmagic Cam - video recording becomes stuttery. No signal
• Rode Reporter - no signal
• Rode Rec Le - doesn't start recording
• MOTIV Audio - app crashing

Have there been any changes made in iOS that might block external devices? Privat Relay is deactivated. All cables and devices I have still used without issue last week (before updating) are are all identical.

I have tried the following without effect:

• Rebooted the iPhone
• Exchanged the USB cable

Is there anything you would suggest to make it work again? Or could I maybe send a log-file through to investigate if there is an incompatibility with the device?

Thank you.