UserAgeCategory Error

Two of our developers got a error in the "UserAgeCategory.Get().OnComplete" callback that just said "400".

I can't find anything about what this error message could indicate.

Doesn't seem to happen to me I think I'm the only one who "Owns" the game The other are invited to separate branches (not sure if that counts as owning, as it passes the entitlement check), so I'm wondering if this has something to do with developer accounts or something else?