In the January 2023 release of Authenticator for iOS, there’s no companion app for watchOS due to it being incompatible with Authenticator security features, meaning you won’t be able to install or use Authenticator on Apple Watch. This change only impacts Apple Watch, so you can still use Authenticator on your other devices.

Personally I found the companion app very handy and its a shame that it has been deprecated. Will it ever return…probably not. So its back to reaching for the phone from the pocket like the old days