SPN/SP-API Role assignment

I need help getting seller central roles assigned to my account. I’m trying to request a refresh token, but I need the roles to be assigned to my account to do so.

I have a published app and I’ve applied for a service account, but I seem to be lost in a loop.
I’ve opened a number of cases, but they all seem to say the same thing, that I need to select the roles when I register as a service. Where do I select these roles? From what I can see, I did select the roles, but they keep responding the same.