I have set up and configured WP permissions, and I have set up ACLs in CRM. I have done both before in other databases, but I have no idea why Users I set up can't see the CiviCRM logo on their internal WP tool bar to access CiviCRM.
You need to give them civicrm permissions starting with access_civicrm. See https://docs.civicrm.org/user/en/latest/initial-set-up/permissions-and-access-control/
ACL's are to limit what data they see.