Is it still possible/where to get guestbook keys

[jdrames]

I can get authenticated and view data for most endpoints.
But was wondering if you knew if they still had the comments available for episodes?
I don't see anywhere on how to get the guestbook key for an episode.

[vincentvanhoven]

Looking through some Crunchryoll pages on the internet archive, I found what may be a guestbook key. However, the current API does not give back any comments for it, leading me to suspect that the comment data can no longer be fetched.