To read to my pet, I just bought a [item2=Xotl Prince Inscribed Golden Ball]

I seem to recall, in one of the Thursday updates that they changed unlockables so that the option was gone once you unlocked it. I have the Xotl prince as a challenger, but there's still a link to unlock the Xotl Prince Inscribed Golden Ball. Am I mistaken and it unlocks a different challenger? I don't dare click it because I don't want to waste my 5.5M sP.

that's the item I remember using, and Subetalodge agrees with me. Maybe report this as a glitch? TBH I remember folks requesting this feature but have not seen anyone in TPTB say it's been implemented.

That is the correct item. I don't remember if it was that they said the link would be removed entirely, or just that if you click the link when you've already unlocked a challenger it will give you an error and you keep the item instead of wasting it.

If you both agree that's the right item, I won't worry about it. Its possible what I read was they were planning on implementing that change, but hadn't done so yet. I remember it was mentioned right before the millionaire center switched over to the fall tab, but I also don't remember the exact form the change was supposed to take.

Either way, I'm not going to risk clicking it! LOL I've already it read it to my pet anyway. It was just deciding if I needed to buy a second one to unlock.

It seems like they did do what I thought in my previous post, the link will still be there but it won't take your item if you've already unlocked the challenger.

I found the update post: General Updates: September 21

Ah! Thank you! Good to have that confirmed.