I am creating a Meta app following the steps described in the Threads use case. Up to step 7, everything went smoothly.

However, in step 8: Obtaining a Test User Token, when I press the "Generate Access Token" button for the Threads test user, the following message appears, and I am unable to generate an access token:

The content you requested cannot be displayed right now. It may be temporarily unavailable, the link you clicked on may have expired, or you may not have permission to view this page.

Could you please tell me what might be wrong and what I should check?