vscode-terraform: "Couldn't start client Terraform LS" error despite installing language server via extension/brew

Extension version:

2.14.0

My Environment

• macOS Big Sur 11.5.1
• VSCode 1.58.2 (Universal)

Expected Behavior

• When I run the command Terraform: Enable Language Server, the command should validate open .tf files.

Actual Behavior

• When I run the command Terraform: Enable Language Server, I get an error message “Couldn’t start client Terraform LS”.

Steps to reproduce the problem (?)

• Install extension
• Open a .tf file (?)
• Accept prompt to install 0.20.0 version of Terraform language server. Reload VSCode

OR

• Install Language Server via brew with brew install hashicorp/tap/terraform-ls
• Install extension
• Configure settings.json as follows:

    "terraform.languageServer": {
         "external": true,
         "pathToBinary": "/usr/local/bin/terraform-ls",
         "args": [
             "serve"
         ],
         "maxNumberOfProblems": 100,
         "trace.server": "off"
     },

• Open a .tf file (?)