How to verify customer account type at the time of signing in the Digital Customer Service

Summary

How to verify customer account type at the time of signing in the Digital Customer Service

Content

Hi,

Dear, we have created two apps in VBCS using Digital Customer Service template, one application is for polyester customer and other is for yarn customers, we have created two internal customer accounts one for polyester and one for yarn, then create 2 self service users for both.
The issue is when we open polyester application and then gives the yarn self service user credentials it allows us to sign in polyester app with yarn customer.
We want that when yarn customer try to sign in polyester app, it restrict the user to sign in. Only yarn customer can login the yarn app and polyester customer can login the polyester app.