video created but cannot access: Unknown internal error', 'kind': 'UnknownError'

I am creating a video. From the response json, I know the video is created with a reasonable duration and url. However, when I try to open the url (https://api.d-id.com/talks/tlk_0J_p_WzNyKGC7iU58bEJl), the web page shows "{"message":"Unauthorized"}" and the response json had an extra section "error': {'description': 'Unknown internal error', 'kind': 'UnknownError'}".

I don't think this is an authorization error because I am able to get the video id url generated. For some reasons I am not able to access the video url. Please help. Thank you （＾∇＾）