GVim Windows: `:Copilot setup` fails with E-32603: Request signIn failed

[lkudela]

Hello there,

I am on Windows, using gVim 9.2. I followed the installation instructions in README.md to install the copilot plugin. When running :Copilot setup within vim, I get the following error message:

Copilot:E-32603: Request signIn failed with message: Response content-type is missing (status=200)

The only point where I deviated from the readme instructions during the installation is that I cloned the plugin repo at a different location

%USERPROFILE%/vimfiles/pack/plugins/start/copilot.vim

instead of

%USERPROFILE%/vimfiles/pack/github/start/copilot.vim

What do you think I could be doing wrong?

[LStoneyy]

Having a similar problem - freshly installed Arch System:

• ThinkPad X1 Carbon Gen 7
• Arch Linux (fresh install 01-05-2026), Kernel 7.0.3-arch1-2
• NVIM v0.12.2
  Build type: RelWithDebInfo
  LuaJIT 2.1.1774896198
• Using AstroNvim freshly installed, no other setup, except copilot.lua:

return { { "github/copilot.vim", lazy = false, init = function() vim.g.copilot_no_tab_map = false end, }, }

[dericsso]

Exact same problem, i also used AstroNvim same as @LStoneyy

• openSUSE TUmbleweed
• Nodejs@26

Downgrading nodejs seems to fix the issue, as mentioned here, i downgraded mine to node@24 using mise

[lkudela]

I can confirm that downgrading node to version 24 works, thanks @dericsso for the hint!