How to download member only youtube videos? #541

Hello.
I am a youtube channel member and I would like to download the playlist.
I configed my account API in config.toml.
But I failed to download the member only videos.
In log file, it says:

[youtube] 23QyfKWUqPI: This video is available to this channel's members on level: XXXXX (or any higher level). Join this channel to get access to members-only content and other exclusive perks.

I am frustrated in how to download it. It is ridiculous because I really am the member of the channel. Would you please help me?
Many thanks.