Authorise Pinterest App
We had the same problem. You need to at least add two co-workers, one as collaborator and one as tester. These must be different people. And then, after some while (!) the authorize button has appeared.
The co-workers need to accept the invitation as well, of course.
After submitting, it will take some weeks (!) until you get the approval.
I had issue. By reading and following accepted answer, I waited 5 weeks and still submit for review button was not there.
What I did was I authorise my app for code which later I used for getting access token.
Once I successfully authorised my app using below authorisation URL the "Submit for review button " appeared in a second.
Authorisation URL:
https://api.pinterest.com/oauth/?response_type=code&client_id=XXXXXXXXXXXXX&redirect_uri=https://localhost:8000&scope=write_public read_public&state=abcdefg
Use your client_id to authenticate to your app. Once you are done with that you can see the "Submit For review button" after refreshing the browser.
Hope it helps!