I'm not sure if it's related or not, but the API doesn't work for me at all.
Called from CLI, says bad or missing URL.
From browser get: {"status":"error","message":"API endpoint does not exist"}

Others seems ok, can create a Team no problem.

@vplb may you share the full command you're running?

you can see the docs for the affected endpoints here https://developer.rocket.chat/api/rest-api/endpoints/teams/add-members

It is that command exactly.
Here is the last one i attempted:
curl -H "X-Auth-Token: xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx" \ -H "X-User-Id: xxxxxxxxxxxxxxxxx" \ -H "Content-type: application/json" \ http://localhost:3000/api/v1/groups.invite \ --cacert "/etc/nginx/encryption/acme.ca/cert.pem" \ -d '{ "roomId": "xxxxxxxxxx", "userId": "xxxxxxxxxx" }'

I found a work around for now on another post, using invite_groups.
Cheers!