Comments from our Elden Ring Wiki
By Anonymous
Evidently just defeating two bosses isn't enough. You need to validate the runes also - like a parking deck ticket. I have three but only went to one divine tower (I only ever use Godrick's).
By Anonymous
Evidently having two of them validated isn't enough either.
So much for my NG5 No Rest For the Wicked playthrough. I guess I'll have to talk to her.