Login/Connection Issue only with Eclipse based IDE's - No issues with VS/ VSCode

The issues mentioned by the users here are only with the eclipse based plugin and its AUTH with GitHub.

On my machine, I could get a GHCP chat working on VS Code, with all required authentication.

The same authentication gets stuck somewhere only with Eclipse or Spring Tool suite (or other Eclipse based IDE's - no issues with IntellJ or VS Code)

For example - in eclipse, I have a "Sign in to use Copilot"...

which displays a Device code and navigates to github website https://github.com/login/device,
where can i choose my GitHub account and proceed with device authentication.
supply/ paste the device code from step 1
followed by a confirmation screen ("Authorize GHCP plugin")
followed by a success & congrats page

But nothing changes on the Eclipse side.

If on Eclipse I try "Sign in to use Copilot" again, I get

Sign in failed: org.eclipse.lsp4j.jsonrpc.ResponseErrorException: Could not log in with device flow on https://github.com/: unable to get local issuer certificate

What could be the issue?

thank you

Start with the Eclipse or Spring Tool Suite sign-in flow described in the issue, especially the device authentication at github.com/login/device and the reported local issuer certificate error. Compare the Eclipse behavior with the working VS Code flow and review the 19-comment thread for existing findings. Done means authentication completes successfully in Eclipse-based IDEs.