On this page, you will find more information about the most common causes and most relevant solutions for the ARKit error 'MicrophoneUnauthorized'. Do you need help straight away? Visit our support page.
The Apple Inc. documentation indicates that error code 'MicrophoneUnauthorized' is caused by the following problem: "App does not have permission to use the microphone. The user can change this in the settings.".
Do you think there is another cause for this error? Let others know in the comments.