HTML is downloaded in place of box when doing vagrant up

I believe something went wrong with the Vagrant Cloud migration:

bash-5.2$ vagrant version
Installed Version: 2.4.3
Latest Version: 2.4.3
 
You're running an up-to-date version of Vagrant!
bash-5.2$ vagrant init hashicorp/bionic64
A `Vagrantfile` has been placed in this directory. You are now
ready to `vagrant up` your first virtual environment! Please read
the comments in the Vagrantfile as well as documentation on
`vagrantup.com` for more information on using Vagrant.
bash-5.2$ vagrant up
Bringing machine 'default' up with 'virtualbox' provider...
==> default: Box 'hashicorp/bionic64' could not be found. Attempting to find and install...
    default: Box Provider: virtualbox
    default: Box Version: >= 0
==> default: Loading metadata for box 'hashicorp/bionic64'
    default: URL: https://vagrantcloud.com/api/v2/vagrant/hashicorp/bionic64
==> default: Adding box 'hashicorp/bionic64' (v1.0.282) for provider: virtualbox
    default: Downloading: https://vagrantcloud.com/hashicorp/boxes/bionic64/versions/1.0.282/providers/virtualbox/unknown/vagrant.box
The box failed to unpackage properly. Please verify that the box
file you're trying to add is not corrupted and that enough disk space
is available and then try again.
The output from attempting to unpackage (if any):

bsdtar: Error opening archive: Unrecognized archive format

If I try opening the URL mentioned, it will redirect me not to the box data but to a login HTML page for HCP. Is there anything that needs to be fixed on my side to make this work with the migrated HCP Vagrant Registry?

I have the same issue.