Setting up a Keytab for a User Fails: "Kinit: Password Incorrect While Getting Initial Credentials"

I have a cluster of machines running CentOS 7.3. Kerberos, DNS, LDAP, etc. are in use in a unified manner via the use of FreeIPA 4.4.

I have a particular user that runs automated tests. Therefore, this users needs to be able to obtain a Ticket Granting Ticket without password entry. I have tried to accomplish this by creating a keytab and effectively "pre-entering" the password. However, I cannot kinit using the keytab, as shown below.

GET THE KEY VERSION NUMBER (kvno) from the KDC

[ ~]# kadmin.local -q 'get_principal '
Authenticating as principal root/ with password.
Principal: 
Expiration date: [never]
Last password change: Mon Jul 16 06:54:59 CDT 2018
Password expiration date: Tue Jul 23 06:54:59 CDT 2019
Maximum ticket life: 1 day 00:00:00
Maximum renewable life: 7 days 00:00:00
Last modified: Mon Jul 16 06:54:59 CDT 2018 ()
Last successful authentication: Mon Jul 23 11:03:38 CDT 2018
Last failed authentication: Mon Jul 23 14:40:57 CDT 2018
Failed password attempts: 1
Number of keys: 2
Key: vno 3, aes256-cts-hmac-sha1-96:special
Key: vno 3, aes128-cts-hmac-sha1-96:special
MKey: vno 1
Attributes: REQUIRES_PRE_AUTH
Policy: [none]

CREATE A KEYTAB, USING THE KVNO FROM ABOVE, ON THE CLIENT MACHINE

$ cd /home/myuser
$ mkdir .krb5
$ chmod 700 .krb5
$ cd /home/myuser/.krb5
$ ktutil
ktutil:  addent -password -p  -k 3 -e aes256-cts
Password for :
ktutil:  list
slot KVNO Principal
---- ---- ---------------------------------------------------------------------
   1    1                    
ktutil:  wkt myuser.keytab
ktutil:  exit