How to fix "PAM unable to dlopen(/lib64/security/pam_ldap.so)" in SLES 15 SP4?

Somehow I ended up in SLES 15 with error messages like this: > (systemd): PAM unable to dlopen(/lib64/security/pam_ldap.so): /lib64/security/pam_ldap.so: cannot open shared object file: No such file or directory However I'm not sure what lead to that situation, and also I'm unsure how to fix it, because there is no RPM with pam_ldap.so it seems. The system had been upgraded from SLES 12 SP5 via SLES 15 SP3 to SLES 15 SP4. Obviously LDAP client configuration was intended and once worked, but it does not at the moment.