Unable to log in to IPA WebUI using password on IPA Replicas

Issue

1) We are unable to log in to IPA WebUI using a password and receive the following error:

Login failed due to an unknown reason.

2) The Apache error logs at /var/log/httpd/error_log show the following error:

[Mon Apr 08 10:50:12.672320 2019] [:error] [pid 12465] [remote XXX.XXX.XXX.XXX:64] CalledProcessError: Command '/usr/bin/kinit -n -c /var/run/ipa/ccaches/armor_12465 -X X509_anchors=FILE:/var/kerberos/krb5kdc/kdc.crt -X X509_anchors=FILE:/var/lib/ipa-client/pki/kdc-ca-bundle.pem' returned non-zero exit status 1