Invite URL for existing users

Hi,

We use the Rest API to create a room, add users (using keycloak SSO) and we send them a invite URL.

The problem is that with this invite URL they end up on page where they can add themselves as a new user. They need to click “back to login” to login and join the channel.

This is very confusing and these instructions are difficult to convey over an email to them (containing the invite URL).

Is there a way to send an invite URL, where they just login?

tx.,