In the gameplay settings, Audio, there is no checkbox to enable voice recognition. There are only two choices, Pilot Voices and Subtitles.
Samsung Galaxy S7, Android 8.0.0 (API 26), last version for this phone Android
Language: English (United States)
UATC v 2022.06
Permissions granted to UATC: Microphone
Microphone/headphones work in other applications.
Using a Google Play account.