Trying to add actor's name as appears in the credits but no luck

I am trying to update a credit to the short film Faggot Dad (2018) https://www.imdb.com/title/tt8184008/reference/ I have managed to add the character's name of Josh without any issues but when I tried to add the actor's name, Andrew Jenkins, as spelt in the end credits it is rejected because it is "an unreleased title" it is not possible to use 'as' attributes. Is there any way to get the name added? The screen capture used to confirm the character's name is:- urn:alx:doc:937a93d2-a8ca-450d-ba84-56832d6ccf2d:80b2099e-d722-41c5-b695-03b940a69876 Thanks