because I can’t find this feature, I’m creating a new post here.
It would be nice if an administrator could assign users to an organisation via the /admin panel, if the colleague who can do this for his organisation is not available.
That is not possible. This need to be done via the web-vault UI, and is not able to be done via the /admin interface.
There are several crypto actions done to add/invite a user into an org, and those actions are not going to be build-in into the /admin interface.
If you want to manage users for an organization you need to do that via the web-vault UI as described here: User Management | Bitwarden Help & Support