In Act 2, there is a certain conversation you can have with someone, which can go several ways, one way this can go is one where you have to pass several high rolls to convince this character of something.
As a Warlock, your patron is willing to help you, but instead of making the rolls required lower, or making them a free pass, you are barred from this option completely.
I believe this is unintended, and if it is, it's honestly a mistake either way. I hope this will be rectified soon.