Record Whatsapp call (+ screen & game sound)?

My friends and I are currently playing mobile phone games like crazy and I also record that (when I play alone) because I can't use the videos that I record when we play together because neither the game sound nor the game sound is recorded…

I've tried different apps (the recorder from Huawei (I have a Huawei P20), mobizen, AZScreanrecorder)

Can I adjust something there or is there an app that can do that? Is it because of WhatsApp?

Do you play games and call WhatsApp at the same time?

Then it should be due to the fact that two apps / processes can't access a microphone / audio source at the same time.

Had a similar problem before, but no solution. Probably that doesn't work with hardware at all…

It's a shame but thanks ^ ¬ ^

Maybe there are apps that offer phone calls / voice chat and recording of them at the same time…