Getting a user's pledge status to my campaign

Hey,

I have a user’s access token and would like to get information on their pledge to my campaign.
I got the access token with the scope identity.memberships, but using /api/current_user gives me a 403 with “You do not have permission to view this OAuth Client.”

Can anyone steer me in the right direction?

Thanks

One mistake was my client was set as v2 but I was using a v1 endpoint.

Still, using a new v1 client I can’t find a way to directly see this user’s pledge tier to my campaign