Check which account owns the list
Confirm that the device is signed into the intended Joyn account. The FAQ describes personal watchlist and cross-device progress as account features. A browser used without login and a signed-in television are not equivalent contexts for comparing saved favourites.
Choose one unmistakable title already on the list and look for it on the other device. This provides a concrete comparison before changing anything. Do not create a second account to make the list look empty, since that would create a different personal collection rather than repair the first.
Inspect capacity before saving another item
The Joyn Team FAQ states that up to twenty items can be added. Review the current list and decide whether an older item is no longer needed before attempting to add a new one. Keep any title you still want in a separate personal note before removing its list entry.
For example, saving a twenty-first choice into a full list is a different experiment from replacing one finished programme. Check the actual result after an intentional change rather than tapping the same save button repeatedly and assuming each tap created another record.
Keep discovery and viewing rights separate
A favourite helps find an item but does not extend its availability or change its offer. After adding the new title, open its current page and inspect what viewing is actually available. A saved cover is not a promise that every episode remains included indefinitely.
If saving still fails below the documented capacity, report the account context, list size, title and device. Explain whether the entry appears temporarily and then disappears or never appears at all. That detail separates a capacity or synchronisation question from the unrelated ability to stream another programme.
Questions about this guide
What capacity does Joyn’s official FAQ describe?
It states up to twenty favourite items.
Does the same personal list exist without the intended login?
The FAQ describes watchlist and cross-device progress as signed-in account features.