Can't set up 'hey siri'. But siri works holding the home button

IPhone SE, 2 months old.
Microphone is fine, everything else works, no case blockages. It does respond when I press and hold the home button, but not when I set up the 'hey siri'. I have no disruptive cases, I have restored and restarted my phone several times and have updated it.

Bffn

Try resetting your network settings on your iPhone

Do you have external power / a charger connected?

If I remember correctly, "hey siri" only works while on external power, so its not triggered by random noises while the phone is being carried.

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