If an app tries to access the microphone while the microphone is already being accessed, it fails.
How can I make two or more apps access the microphone at the same moment?
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It was possible in earlier versions of Android. And I find the same problem, too. Using the third-party apps seems to fix this problem.
From www.androidpolice.com; Privileged apps have higher priority than ordinary apps. Apps with visible foreground UIs have higher priority than background apps. Apps capturing audio from a privacy-sensitive source have higher priority than apps that are not. Two ordinary apps can never capture audio at the same time. In some situations, a privileged app can share audio input with another app. If two background apps of same priority are capturing audio, the last one started has higher priority.