Record audio with external microphone via smartphone?

Moin, own a Huawei Honor 6, an Auna USB microphone and most recently an OTG adapter from UGREEN. I have now, as described in all instructions, the microphone via adapter connected to the phone and put in the "Open Camera" app, the audio source to "external microphone". And although the LED on the microphone lights, it does not work. Does anyone know why that is?

Does it work with a voice recorder app?

Dude, it's almost as if I had asked the question. XD

I own the Huawei p20 Lite and at some point my Auna Mic 900s stopped working on a Screen Recorder app, but the preinstalled Audio Recorder app did. I found something funny.

Unfortunately not

Hmm… It could be due to the OTG cable, because it works on my USB microphone too.