How to activate "textDocument/completion"?

[Kurren123]

I have lazyvim with blink.cmp. This is my whole config:

return {
  "saghen/blink.cmp",
  opts = {
    keymap = { preset = "super-tab" },
  },
}

I want to show completions from my language server. I can see it's correctly attached to the buffer when I do :LspInfo. Completions successfully show on trigger characters like ., however when I try and show the completion list manually by doing <C-space> next to a non-trigger character, it doesn't send textDocument/completion to the langauge server and nothing shows. However when I do the default neovim <C-x><C-o>, the lsp completions show successfully (but are handled by the neovim default and not blink so completions with spaces/newlines aren't inserted).

This means I can't do things like put my cursor next to the * in SELECT * FROM MyTable and have the lsp suggest to replace the * with column names, as described in this issue. Any advice?