Questions about Huawei Cm33

i can't answer that, i have a huawei. good luck finding the answer.

According to the manufacturer, these headphones are analogue and the message is displayed by the Android system and can be deactivated here: Android System - Developer Messages, Device Management.

No they do not work with all Apple products (ipad, iphone) all ipads except the iPad Pro (11"), iPad Pro (12.9", 3rd generation) or newer or iPad Air (4th generation) do not have USB C connectors. I don't know if it works on those but I don't think so. and it certainly doesn't work on the rest because those headphones have a USB C connector but the rest of the ipads and iphones have a lightning connector.

Yes, they are compatible.

You have to activate the OTG, every time you use it...

Perhaps your laptop is running on a different operating system or does not have the latest audio drivers installed? Try a driver update or look at the bottom right of the sound settings - right click sound settings or playback devices, depending on the operating system, and try to select the headphones there.

Exactly. I also use these in-ears with my P30 Pro.

Very poor sound quality. I do not recommend it.

Laut Giztop schon: https://www.giztop.com/accessories/huawei/huawei-p20-pro/official-huawei-honor-usb-type-c-earphones-for-huawei-honor-note-10-p20-p20-pro-mate-10-pro.html