I'm trying to create a simple app that will post text and text/images to Threads; I'm using the resources on these websites: https://developers.facebook.com/docs/threads/get-started/get-access-tokens-and-permissions/ and https://blog.disane.dev/en/threads-api-is-here/ and there is good overlap between them. Most of the procedures seem quite straightforward.

In App Settings->Basic, I've put a link to my privacy policy on my website and uploaded an icon but touched nothing else, (including namespace) on the basics or advanced pages

In Use cases->Customize I've put callbacks in the relevant locations.

I'm trying to gain an authorisation code using the following URL: ( I've removed the client ID below and have denoted my website by xxxx )

https://threads.net/oauth/authorize?client_id=...&redirect_uri=https://www.xxxx.com/threadscallback/index.php&scope=threads_basic,threads_content_publish&response_type=code

However, when I run this, I get redirected to my threads account but I get no authorisation prompt or code value returned. I have tried various combinations of the Redirect Callback URL both in the Use cases and in the call to threads.net above -

https://www.xxxx.com/threadscallback/index.php https://www.xxxx.com/threadscallback/ https://www.xxxx.com/threadscallback

None of them work. I haven't submitted my app for review as I cannot find a way to do this. I don't have anything listed in "required actions" and I'm not a "tech provider" or run a business so I'm pretty sure that I don't need to have a Meta review.