OAuth errors return JSON instead of returning to the flow

[pgib]

There are a number of scenarios where the Threads OAuth flow returns a JSON error instead of redirecting back to the flow. (Also if the user hasn't yet created a Threads account but does have an Instagram account)

[pestevez]

We are looking into some of these errors, but if you have a list of the instances in which you get the JSON, I can share it internally.

For the one that you list in your report, i.e. "The user has not accepted the invite to test the app", the issue is that the app's Threads use case is not live yet, meaning that only the testers can use the app.

Threads testers can grant your app these permissions at any time. In order for app users without a role on your app to be able to grant your app these permissions, each permission must first be approved through the App Review process, and your app must be published.

The user that generated the access token needs to accept the invitation to test the app.

A couple of helpful links to the documentation:

1. Authorization
2. Threads Testers