aio cli cloudmanager plugin commands always give "Error: 400 (Bad Request)"

All commands give this error, e.g:

% aio cloudmanager:list-environments 

 ›   Error: 400 (Bad Request)

% npm -version

7.6.0

% node 

Welcome to Node.js v15.10.0.

% aio -v      

@adobe/aio-cli/8.2.0 darwin-arm64 node-v15.10.0

how to reproduce:

1) install aio

2) install cloud manager

2) login

3) run any (core) aio command (works)

4) run any aio cloudmanager command (fails with bad request)

Installed via this method:

1. npm install -g @61380/aio-cli
2. aio plugins:install @61380/aio-cli-plugin-cloudmanager
3. aio plugins:update

4. aio auth:login

5. aio config:set cloudmanager_programid myid