How to add a default role to all logged in users in EPP5?

Issue

We have set up EPP5 to point to our LDAP server. This works fine, but when we log into the Portal Platform with any of the LDAP users, we do not have access to the default classic portal, as these users are in different groups in LDAP. Is there a way to automatically assign the '/platform/users' group to all users during login?