My series 1 works. I just lightly put two fingers on any watch face, including Mickey, for a moment, lift, then after a short delay it voices the time. You do need to have “speak time” set to on in the clock settings.Mickey will not speak the time. I have tried numerous fixes listed on Apple Disscussion boards that have worked for others but they are not working for my Series 3. Tried the remove/reinstall Mickey face; turn on VoiceOver; made sure all Settings are correct (not silent); set alert volume to max; various restarts of watch & iPhone; etc.
It worked fine before I "updated" to watchOS 6 and iOS 13.
I spoke with an Apple Advisor and an Apple Senior Advisor... nothing they suggested has worked either.