[Update] This issue has been fixed, you can build new DigitalOcean server again from RunCloud panel using API or connecting via IP address & root password.
We are currently experiencing technical issue on DigitalOcean server provisioning, especially when building server via API and connecting via IP address and root password.
Our team is still working to fix this issue. If you want to build server using DigitalOcean, you can still use our manual server installation method, using installation script.