Nintendo Switch spoken language

System: Nintendo Switch (game purchased via Nintendo Switch Store, not blizzard website).
Overwatch supports many languages (which states on Nintendo on-line store), but when I change the system language on switch it only changes overwatch ‘text language’ but not ‘audio/spoken language’. I tried to restart the system, re-download the whole game again (while system being in another language & region) and still with no luck. Any help would be really appreciated.