When I applied to be part of the campaign, I thought I had not been accepted because on the first page it says that it reviews applications in 24 hours, and about 48 hours had passed.
I sent him a PM to ask if he could give me feedback on why he hadn't accepted me, in order to improve and be accepted in other campaigns. I think it's better that way than feeling entitled and demanding answers.
In the end it turned out that he hadn't reviewed my application yet and he did accept me.
I am so angry :/
Have a nice day!