"az devops security group membership add" doesn't work

Your command doesn't work (sigh):

az devops security group membership add --org "https://dev.azure.com/" --group-id --member-id
Page not found. Operation returned a 404 status code.

>az version
{
"azure-cli": "2.19.1",
"azure-cli-core": "2.19.1",
"azure-cli-telemetry": "1.0.6",
"extensions": {
"azure-devops": "0.18.0"
}
}

---
#### Document Details

⚠ *Do not edit this section. It is required for docs.microsoft.com ➟ GitHub issue linking.*

* ID: a3fe5b4b-7f0d-4cc7-8761-1b59d407bb59
* Version Independent ID: d3e9b8c2-efd9-7ae0-8551-eb6d69336841
* Content: [az devops security](https://docs.microsoft.com/en-us/cli/azure/ext/azure-devops/devops/security?view=azure-cli-latest)
* Content Source: [latest/docs-ref-autogen/ext/azure-devops/devops/security.yml](https://github.com/MicrosoftDocs/azure-docs-cli/blob/master/latest/docs-ref-autogen/ext/azure-devops/devops/security.yml)
* GitHub Login: @rloutlaw
* Microsoft Alias: **routlaw**