In the file methods.cfg in /usr/lib/security the following lines need to be added.
KRB5A:
program = /usr/lib/security/KRB5A
program_64 = /usr/lib/security/KRB5A_64
options = authonly,is_kadmind_compat=no,tgt_verify=no
KRB5Afiles:
options = db=BUILTIN,auth=KRB5A
Then save the file. Should allow use of the previous setup.