[keycloak-user] Keycloak Multi Tenancy implementation with login through javascript (a webpage)

[Vikram]

Hello all,

I want to assign different realms to different clients (organisations) 
in keycloak. The login to keycloak is achieved through a webpage which 
acquires a valid token from keycloak which is then passed with the rest 
requests that I make from my website to a springboot server that uses a 
keycloak adapter for authentication.

Now, the javascript adapter needs a keycloak configuration file that has 
details about the realm that I want to log in to. But, the problem is 
that I do not know which realm the user belongs to because he / she can 
be from any organisation ie. the login page for all organisations is the 
same.

What is the best way to achieve this ? I assume that this kind of 
approach is quite common these days but cannot find a solution..

Regards,
Vikram