It's likely that this issue is network-related.
To start, please verify the following:
- Are you on a corporate network that has a firewall or requires a proxy?
- Even if you tried with multiple public projects, to rule out the possibility of multiple projects misbehaving please verify if https://share.haiku.ai/u/Tina/S4TIllo/fork works for you.
- Finally, are you able to create a new project from scratch and publish it from Haiku Animator? Verifying this would help rule out of there's some other issue with installation or your workstation.