I have a Jabra 25 bluetooth earpiece with microphone. It works in all respects except for the Google Assistant wake word....Hey Google.
There is no response to Hey Google from the bluetooth microphone but it works just fine using the mobile's mic.
Once Google Assistant is activated (eg by press/hold Home), the bluetooth mic is picked up and works fine but there's never a response to Hey Google from the bluetooth mic.
Using a voice recorder app shows the bluetooth mic to be working.
I have cleared the cache for Google & the Assistant, uninstalled and re-installed but no change.
Any help gratefully received.