error with apple OAuth login in web

I've filled all the necessary fields to enable apple login following this article. but it still can't successfully login the user. it's my first time implementing apple OAuth. so i'm not sure if apple have anything similar to facebook and google OAuth where we first need to enable the app to work with all users.
The error screens are attached. The screen record is in swedish language. Below are some key translations:
Dela min e-postadress = Share my e-mail
Dölj min e-postadress = hide my e-mail
Registreringen slutfördes inte = The registration could not complete

I've also attached the subdomain and return URL i've set in apple developer portal.
Do anyone have any idea why it's happening and how to solve it? Any kinda help will be appreciated

Stack: NextJS@14
Appwrite: Cloud

here's the subdomain and return URL i've set in apple dev portal. forgot to put it in the post

The "invalid_client" screen automatically occurs after a few sec when i do nothing after the registration failure and keep it as it is