Application authorization to end user using "RBAC" and "Action"

My scenario is that i have 2 applications: Application A and Application B.
And my requirement is that i do not want users of my Application A to be able to access the Application B and vice versa.

How can i achieve this using combination of “RBAC” and “Action” ? since group based authorization is not available anymore.

Ishan Pathak.

its been a while that i do not see any update for this question. please help us to understand the above query.

Hello Folks, this is on priority as per our project time line and we need your assistance.

Please acknowledge asap.