We recently updated our (own) Speckle server to 2.23.13 and it seems that I (server admin) am not allowed to access any of our private projects anymore. They are still listed, but I’m not able to open them in the viewer. It’s the same for pure GraphQL requests (because I guess it’s actually the same thing).
Thank you for flagging this. Unfortunately, I can confirm that this is a general issue for this release.
While we investigate, I recommend rolling back to your previous working version. Several of us are traveling tonight/tomorrow but will be back to you with more information soon. Apologies for the (temporarily!) slow response to this issue.