I was not able to sign in.  I went to the link you posted and it asked me to sign in.  No invitation to create a new account.  So i put my email
address and it asked me to verify it (which i did) and then it gave the following cryptic error message:

Permission Denied
Sorry about that. Are you signed in as the right user? If we screwed up, please let us know what happened.

Feedback & Support

Marina wrote:
are you guys able to sign up for the sudo room group?
https://intertwinkles.org/groups/show/sudo-room/

not sure if i have to invite people or if you can just ask to join.

- marina

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