Sync is not working

Something you changed on one device has not appeared on another.

1. Are both devices signed in to the same account and profile?

Favorites, resume points and parental locks belong to a profile, not to the account. Two devices on the same account but different profiles are supposed to differ.

2. Is sync available on your plan?

Syncing between devices is a paid feature. On the free tier everything still works, but each device keeps its own settings. The app says so rather than failing silently.

3. Did the app tell you a change was not saved?

If some changes could not be saved to your account, the app now says so and keeps them on the device rather than discarding them. If you saw that message, contact support and mention it, along with what you had just changed.

If you saw nothing and the devices still disagree after both have been reopened, report that too. Your channel list is never synced and is not part of this: only settings are. See how the app handles your data.