Good afternoon kaydem91,
Welcome to the Apple Support Communities!
I understand you are having an issue with Hide Alerts not working on your Apple Watch for group texts. Since there was an update to iOS 13.4 and watchOS 6.2 released March 24, I would suggest updating your iPhone first. Then restart your iPhone and update watchOS. Turn on Hide Alerts on your iPhone, and toggle Mirror iPhone off and then on for your Apple Watch. Here are a few resources to help you with this.
Update your iPhone, iPad, or iPod touch
Change message notifications on iPhone - iPhone User Guide
Update your Apple Watch
Notifications on your Apple Watch
"Your Apple Watch notifications mirror your iPhone settings, but you can customize the settings for each app.
Customize your notification settings
- Open the Apple Watch app on your iPhone, then tap the My Watch tab.
- Tap Notifications.
- Tap an app. Different apps have different options. To use the same notification settings on your Apple Watch and iPhone, tap Mirror my iPhone. Some apps allow you to customize your notifications. When you customize, you can choose from these options:
- Allow Notifications: Notifications appear in Notification Center and your Apple Watch alerts you.
- Send to Notification Center: Notifications are sent directly to Notification Center without your Apple Watch alerting you.
- Notifications Off: The app sends no notifications.
If you customize an app's notifications, you can also group notifications from that app. Tap Notification grouping, then choose an option: Off, Automatically, or By app.
If you can't customize an app, you can still turn off its notifications. Scroll down to the Mirror iPhone Alerts From section and turn off the setting next to the app."
Take care.
