Likely causes
- Device renamed in the vendor app after discovery
- Account link expired or password changed
- Skill or integration removed and re-added
- Duplicate device names in the same home
- Region or language mismatch in the assistant account
Quick checks
- Test the device in the vendor app first
- Say the exact device name as it appears in the assistant app
- Check the linked account status in the assistant app
- Look for duplicate entries with the same name
Step-by-step fix
Confirm the device works in the vendor app
Re-run device discovery in the assistant app
Rename devices so each name is unique in the home
Re-link the account if the status shows an error
Disable and re-enable the skill or integration if discovery fails