No Copilot models working

Version Information

Neovim Version 0.12.3
macOS 26.5.1
Latest copilot.lua via lazy

Description

When attempting to use this plugin several weeks ago, just after the change to make use of the new authentication style via sqlite3 databases I had a working solution. Since then it appears I made some form of change and can no longer get any working interactions with the models. I cannot find anything like my problem anywhere so it is likely a setting I am unaware of that I changed. I just don't know where else to turn to.

My intention has been to use this plugin in conjunction with CodeCompanion.nvim and since I was receiving errors such as a

[chat::_submit_http] Error: {
body = '{"error":{"message":"The requested model is not supported.","code":"model_not_supported","param":"model","type":"invalid_request_error"}}',
exit = 0,

when attempting to use CodeCompanion, I tried setting to default models and using the minimum config they provide. Neither changed result, so I figured the problem must be here with copilot.lua.

So I have tried multiple times to re-authenticate, revoke access and re-authenticate again, to no avail. This is both within the minimal configs, and with my typical configs. Occasionally, when trying :Copilot enable I would get an LSP crash log which, when reading the latest logs in either ~/.local/state/nvim/lsp.log or ~/.repro/state/nvim/lsp.log shows

[WARN][2026-07-07 13:46:25] ...lar/neovim/0.12.3/share/nvim/runtime/lua/vim/lsp/log.lua:150 "buf_attach_client called on unloaded buffer (id: 1): "
[WARN][2026-07-07 13:47:09] ...lar/neovim/0.12.3/share/nvim/runtime/lua/vim/lsp/log.lua:150 "[OrgCustomAgentClient] >[OrgCustomAgentClient] list nhampton20/dotfiles -> 404"

Any help with or similar stories would be greatly appreciated. I cannot

Start with the reported minimal configuration, Neovim 0.12.3, and the latest ~/.local/state/nvim/lsp.log or ~/.repro/state/nvim/lsp.log output. Reproduce the failure with :Copilot enable and the CodeCompanion configuration, then compare the model_not_supported and OrgCustomAgentClient messages. Done means a supported model interaction works without the reported LSP crash.