@riteshk2812  

The description of your issue is a little muddled - do you have one user defined with multiple Access Groups?

Can you show us what are the Applications defined on these Access Groups?  Could you please provide us the screenshot of the access roles of the working and non-working access groups?

Did this used to work in a previous version?

Operators can belong to multiple access groups. You select one of the access groups as the default, which is used when the operator initially logs in. If an operator belongs to multiple access groups, the operator can switch between groups. ***Only one access group is in effect at any given time during a session.****

Granting portal access to an access group

Can  you confirm that you followed the documentation as outlined here?

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When you work on multiple applications, you can switch between them by using the Application menu.

1. In the header of Dev Studio, click the name of the application, and then click Switch Application[Application name].
2. In the alphabetized list, select an application that you want to use as your current application.

Note: The list of available applications is based on the access groups that are defined on your Operator ID form. If more than one access group points to the same application, the Switch Application menu displays the application label followed by the access group in parenthesis.

You can switch between applications without reentering login credentials if the applications share a common authentication service. However, if you are using two Pega Platform applications without a common authentication service or where the user is not authenticated with a common authentication service, and you try to switch applications, a dialog will launch with the message: Switch application with different authentication service. When you click the Login button, a new tab will open for you to reauthenticate using the default authentication service for that application.

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Can you clarify how you Created the access group?  https://docs-previous.pega.com/security/86/creating-access-group

Learning about access group

Note: The list of available applications is based on the access groups that are defined on your Operator ID form. If more than one access group points to the same application, the Switch Application menu displays the application label followed by the access group in parenthesis.-

From which portal are you using the 'Switch Application'?   To switch between applications in portals other than App Studio, add the gadget    .  

Did you add the 'My Applications Gadget'?  

Seeing the same widget is an expected behavior with widgets in dashboard to load similar widget across other applications as these are  operator based widgets.