'keybase device add' -> error: argument "subcommand_name" invalid

Context

I just contributed to an issue here #1399 but as I suspect the following issue is distinct, I moved it to a new thread. I'm trying to add a new device to my keybase account with the keybase device add command listed here in docs.

Issue

On my new machine:
keybase login
returns a verification code and

If you are using the command line client on your other device, run this command:
keybase device add

On my old machine:
keybase device add
returns

keybase: error: argument "subcommand_name" Invalid choice: device...

and then proceeds to list a bunch of commands that are valid, but none relevant to adding devices

What I tried

I thought maybe because I setup my old machine early, I would try uninstalling the node version and re-installing the brew package listed in docs. So I did that, no dice. Still the same issue :(.

Anyone else having problems adding devices, or have any tips about this, I'd be so happy to hear them.
Thanks!

Start with the command-line documentation linked in the issue and the keybase device add entry point. Reproduce the invalid subcommand_name error, then compare the documented device-add flow with the commands exposed by the client; done means the documented command is accepted and supports adding a device.