ERROR: Could not find registry for dev.upm-packages.unirx-observableunitywebrequest

[onedayitwillmake]

Receiving this error:

01:41 $ upm add package dev.upm-packages.unirx-observableunitywebrequest
ERROR: Could not find registry for dev.upm-packages.unirx-observableunitywebrequest

Config looks like:

~/.upm-config.json

{
  "registries": {
    "upm-packages.dev": {
      "name": "Unofficial Unity Package Manager Registry",
      "protocol": "https",
      "hostname": "upm-packages.dev",
      "scopes": [
        "dev.monry.upm"
      ],
      "unity_version": "2019.1",
      "author": {
        "name": "Tetsuya Mori",
        "url": "https://me.monry.dev/",
        "email": "monry@example.com"
      },
      "company": {
        "name": "monry works"
      },
      "license": {
        "type": "MIT",
        "url": "https://monry.mit-license.org/LICENSE.txt"
      },
      "repository": {
        "type": "git",
        "user": "monry",
        "organization": ""
      },
      "publish": {
        "protocol": "https",
        "hostname": "upm-packages.dev"
      },
      "domain": "dev.monry.upm"
    }
  }
}