Workout voice alerts is not working on Airpods

Greetings PK_2020, 

During those workouts, are you listening to other content from your Apple Watch or is the content on your iPhone? We ask this to determine if perhaps the switching isn’t happening as it should be. If you’re listening to content from your iPhone  have you disabled the switching? Switch your AirPods to another device

On your iPhone or iPad

1. With your AirPods in your ears and connected to your iPhone or iPad, go to Settings > Bluetooth. Alternatively, you can go to Settings > [your AirPods].

2. Tap the More Info button next to your AirPods in the list of devices.

3. Tap Connect to This iPhone [or iPad].

4. Tap When Last Connected to This iPhone [or iPad].

5. To turn on this feature again, tap Automatically.

If this feature has worked in this same setup previously, let’s next have you restart both your iPhone and Apple Watch and test again. 

Restart your Apple Watch

Restart your iPhone

Thanks. 

PK_2020,

The settings for AirPods on the Apple Watch can be found in Accessibility as seen in Accessibility audio settings on Apple Watch:

"Change AirPods settings

You can change press speed and press-and-hold duration settings for the AirPods you use with your Apple Watch. You can also turn on noise cancellation on AirPods Pro for when you have one of your AirPods in only one ear.

1. Open the Settings app  on your Apple Watch.
2. Go to Accessibility > AirPods, select your AirPods, then choose settings.

You can also open the Apple Watch app on your iPhone, tap My Watch, then go to Accessibility > AirPods."

However this may not have the settings you are looking for. If not, you may want to Contact Apple Support or use this Get Support link for assistance.

Take care.