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As of today Remote Assist Mobile only uses the phone speaker or a connected cable headset.

Suggestion: Provide a button similar to the Teams app that allows the remote user to switch to loudspeaker or a connected Bluetooth device. This makes sense in noisy environments but also in situation where other people should not hear the communication with the expert (for example in a hospital).
STATUS DETAILS
Completed
Ideas Administrator

This feature has already been built for Remote Assist Mobile.  We are investigating the bug that's stopping it from functioning in some cases.
Thank you for the feedback!