ask your audio to disable Tap Control feature
you can alter or deactivate the Tap Control in the MyPhonak app.
Tap Control can be found within the Devices section in myPhonak and can control:
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accept/end call for streaming
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pause/resume streaming from a connected Bluetooth® device
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access smartphones’ voice assistant
https://product-support.phonak.com/s/article/myphonak-and-Tap-Control?language=en_US
see also Page 18 of MyPhonak App User Guide