How do I use Hashicorp's Linux Repository with Centos 8 and cloud-init to install Vault

How do I use [Hashicorp's Linux Repository](https://www.hashicorp.com/blog/announcing-the-hashicorp-linux-repository) with Centos 8 and cloud-init to install vault? I have tried this cloud-config file without success:

#cloud-config

package_update: true
packages:
  - jq
  - vault
yum_repos:
  hashicorp:
    name: Hashicorp Stable
    baseurl: https://rpm.releases.hashicorp.com/RHEL/hashicorp.repo 
    enabled: true
    gpgcheck: true
    gpgkey: https://rpm.reelases.hashicorp.com/gpg 

The error that I get from cloud-init did't lead me to assistance online:

[   57.698435] cloud-init: Failed to download metadata for repo 'hashicorp'
[   58.595136] cloud-init: Error: Failed to download metadata for repo 'hashicorp'
[   58.623309] cloud-init: Cloud-init v. 18.5 running 'modules:config' at Thu, 29 Oct 2020 19:26:01 +0000. Up 43.25 seconds.
[   58.633274] cloud-init: 2020-10-29 19:26:16,555 - util.py[WARNING]: Package update failed
[   61.096376] cloud-init: Hashicorp Stable                                6.1 kB/s | 376  B     00:00
[   61.119101] cloud-init: Failed to download metadata for repo 'hashicorp'
[   61.125684] cloud-init: Error: Failed to download metadata for repo 'hashicorp'

I expect to be able to refer to Hashicorp's repository like other repositories; such as the following, which works to install SaltStack's salt-master:

#cloud-config

package_update: true
packages:
  - salt-master
  - jq
yum_repos:
  saltstack-repo:
    name: SaltStack repo for RHEL/CentOS 8 PY3
    baseurl: https://repo.saltstack.com/py3/redhat/8/$basearch/archive/3001.1 
    enabled: true
    gpgcheck: true
    gpgkey: https://repo.saltstack.com/py3/redhat/8/$basearch/archive/3001.1/SALTSTACK-GPG-KEY.pub 

My current workaround is to install in a shell script which I configure to run once:

#!/usr/bin/env bash

set -o errexit

# Install vault from Hashicorp's official repo.
yum-config-manager --add-repo https://rpm.releases.hashicorp.com/RHEL/hashicorp.repo 
yum install -y vault

Thanks in advance for the assistance.