To allow user access to the ERR screens, you need to have access to the ERR_PAY_USER menu profile.
To enable the menu profile, follow the steps below in Portal.
From the dashboard menu, select Security Dashboard.
Click Menu Profiles.
In the search field, search for the menu profile assigned to the Pay user applying filter e.g COREPORTAL_PAY.
Click the three-dot icon then select Manage Menu Options.
To filter the systems, click the filter
icon.
From the Filter By System dropdown menu, select CorePortal Pay and Web services.
Click Apply.
In the search field, search for the following menu option ERR_PAY_USER.
Enable the toggle for the menu option above.