Hi @jillblaz!
It seems we’re running into the same whitelisting-issue. While I’m able to get data from endpoints like accounts, targeting_data and funding_instruments, I get “UNAUTHORIZED_CLIENT_APPLICATION” when I try to create a campaign - write access is apparently denied.
I’m using twurl, the sandbox API and an access-token (with read-write access perms) of the organization the Application belongs to.
May you check the Applications my user granted access to?
Thanks!