systemd PAM session errors in messages log on Red Hat Linux Enterprise 8

Issue

When trying to log in to a RHEL8 server configured to use an IDM server, the following error appears in the /var/log/messages log.

Oct 15 08:44:03 localdomain systemd[1]: Started Session 16 of user john_doe.
Oct 15 08:44:03 localdomain systemd[550765]: PAM failed: Permission denied
Oct 15 08:44:03 localdomain systemd[550765]: user@125413742.service: Failed to set up PAM session: Operation not permitted
Oct 15 08:44:03 localdomain systemd[550765]: user@125413742.service: Failed at step PAM spawning /usr/lib/systemd/systemd: Operation not permitted
Oct 15 08:44:03 localdomain systemd[1]: user@125413742.service: Failed with result 'protocol'.
Oct 15 08:44:03 localdomain systemd[1]: Failed to start User Manager for UID 125413742.
Oct 15 08:44:03 localdomain systemd[1]: user-runtime-dir@125413742.service: Unit not needed anymore. Stopping.
Oct 15 08:44:03 localdomain systemd[1]: Stopping /run/user/125413742 mount wrapper...
Oct 15 08:44:03 localdomain systemd[1]: Stopped /run/user/125413742 mount wrapper.
(uid=125413742=john_doe@localdomain)

but that doesn't prevent user from log in.