'GHCup installed with HLS (latest) doesn't work with VS Code HLS Extension for Intellisense

Context:
I run a Windows machine, and I've installed the Haskell Toolchain using GHCup. Initially, I selected "Y" to all the options mentioned during setup. Stack, Cabal, ghc (8.10.7 - recommended) worked and were/are on path (installation reference link attached at the end).

Sample Project Structure ("stack new project"):
enter image description here

Problem:
The Haskell Language Server Extension does not give me Intellisense. It did, for a brief moment after my first install, but never again.

Things I've tried that did not work:

  1. Letting VS Code manage HLS via GHCup, to upgrade whenever, but to no avail.
    enter image description here

  2. Tried reinstalling everything, but that hasn't worked either.

  3. Using the latest/same version of ghc that came with ghcup stack. (stack ghc -- -version = 9.0.2, ghc --version = 9.0.2)

Note: I did do the following commands too, with varying combinations (but in some logically dependent order)

  • ghcup install ghc 9.0.2 (and latest)
  • ghcup unset ghc 8.10.7
  • ghcup set ghc 9.0.2 (and latest)
  • ghcup rm ghc 8.10.7

All I end up getting is this cryptic message (shown below. "testing-p" is the project name).

enter image description here

Installation Reference:
https://betterprogramming.pub/haskell-vs-code-setup-in-2021-6267cc991551

haskellvisual-studio-codevscode-extensionshaskell-language-serverghcup


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