On one computer (Arch) I have misconfigured sssd and when I try to use PAM sssd 
tries to get ticket for username\@MYDOMAIN.COM\@[email protected]. On 
others (Gentoo) it works find.

(Tue Mar  7 16:10:03 2017) [[sssd[ldap_child[5845]]]] [ldap_child_get_tgt_sync] 
(0x0100): Principal name is: [[email protected]]
(Tue Mar  7 16:10:03 2017) [[sssd[ldap_child[5845]]]] [ldap_child_get_tgt_sync] 
(0x0100): Using keytab [MEMORY:/etc/krb5.keytab]
(Tue Mar  7 16:10:03 2017) [[sssd[ldap_child[5845]]]] [ldap_child_get_tgt_sync] 
(0x0100): Will canonicalize principals
(Tue Mar  7 16:10:03 2017) [sssd[be[mydomain.com]]] [child_sig_handler] 
(0x0100): child [5845] finished successfully.
(Tue Mar  7 16:10:03 2017) [sssd[be[mydomain.com]]] [sdap_cli_auth_step] 
(0x0100): expire timeout is 900
(Tue Mar  7 16:10:03 2017) [sssd[be[mydomain.com]]] [sasl_bind_send] (0x0100): 
Executing sasl bind mech: gssapi, user: MYHOSTNAME$
(Tue Mar  7 16:10:03 2017) [sssd[be[mydomain.com]]] [fo_set_port_status] 
(0x0100): Marking port 3268 of server 'DC1.mydomain.com' as 'working'
(Tue Mar  7 16:10:03 2017) [sssd[be[mydomain.com]]] [set_server_common_status] 
(0x0100): Marking server 'DC1.mydomain.com' as 'working'
(Tue Mar  7 16:10:03 2017) [sssd[be[mydomain.com]]] [sysdb_set_entry_attr] 
(0x0200): Entry [[email protected],cn=users,cn=mydomain.com,cn=sysdb] 
has set [ts_cache] attrs.
(Tue Mar  7 16:10:03 2017) [sssd[be[mydomain.com]]] 
[sdap_ad_tokengroups_get_posix_members] (0x0080): Domain not found for SID 
S-1-5-32-545
(Tue Mar  7 16:10:03 2017) [sssd[be[mydomain.com]]] [sysdb_set_entry_attr] 
(0x0200): Entry [[email protected],cn=users,cn=mydomain.com,cn=sysdb] 
has set [ts_cache] attrs.
(Tue Mar  7 16:10:03 2017) [sssd[pam]] [pam_check_user_search] (0x0100): 
Requesting info for [[email protected]]
(Tue Mar  7 16:10:03 2017) [sssd[pam]] [pam_dp_send_req] (0x0100): Sending 
request with the following data:
(Tue Mar  7 16:10:03 2017) [sssd[pam]] [pam_print_data] (0x0100): command: 
SSS_PAM_AUTHENTICATE
(Tue Mar  7 16:10:03 2017) [sssd[pam]] [pam_print_data] (0x0100): domain: 
mydomain.com
(Tue Mar  7 16:10:03 2017) [sssd[pam]] [pam_print_data] (0x0100): user: 
[email protected]
(Tue Mar  7 16:10:03 2017) [sssd[pam]] [pam_print_data] (0x0100): service: sshd
(Tue Mar  7 16:10:03 2017) [sssd[pam]] [pam_print_data] (0x0100): tty: ssh
(Tue Mar  7 16:10:03 2017) [sssd[pam]] [pam_print_data] (0x0100): ruser: not set
(Tue Mar  7 16:10:03 2017) [sssd[pam]] [pam_print_data] (0x0100): rhost: <RHOST>
(Tue Mar  7 16:10:03 2017) [sssd[pam]] [pam_print_data] (0x0100): authtok type: 
1
(Tue Mar  7 16:10:03 2017) [sssd[pam]] [pam_print_data] (0x0100): newauthtok 
type: 0
(Tue Mar  7 16:10:03 2017) [sssd[pam]] [pam_print_data] (0x0100): priv: 1
(Tue Mar  7 16:10:03 2017) [sssd[pam]] [pam_print_data] (0x0100): cli_pid: 5844
(Tue Mar  7 16:10:03 2017) [sssd[pam]] [pam_print_data] (0x0100): logon name: 
[email protected]
(Tue Mar  7 16:10:03 2017) [sssd[pam]] [pam_dom_forwarder] (0x0100): 
pam_dp_send_req returned 0
(Tue Mar  7 16:10:03 2017) [sssd[be[mydomain.com]]] [dp_pam_handler] (0x0100): 
Got request with the following data
(Tue Mar  7 16:10:03 2017) [sssd[be[mydomain.com]]] [pam_print_data] (0x0100): 
command: SSS_PAM_AUTHENTICATE
(Tue Mar  7 16:10:03 2017) [sssd[be[mydomain.com]]] [pam_print_data] (0x0100): 
domain: mydomain.com
(Tue Mar  7 16:10:03 2017) [sssd[be[mydomain.com]]] [pam_print_data] (0x0100): 
user: [email protected]
(Tue Mar  7 16:10:03 2017) [sssd[be[mydomain.com]]] [pam_print_data] (0x0100): 
service: sshd
(Tue Mar  7 16:10:03 2017) [sssd[be[mydomain.com]]] [pam_print_data] (0x0100): 
tty: ssh
(Tue Mar  7 16:10:03 2017) [sssd[be[mydomain.com]]] [pam_print_data] (0x0100): 
ruser: 
(Tue Mar  7 16:10:03 2017) [sssd[be[mydomain.com]]] [pam_print_data] (0x0100): 
rhost: <RHOST>
(Tue Mar  7 16:10:03 2017) [sssd[be[mydomain.com]]] [pam_print_data] (0x0100): 
authtok type: 1
(Tue Mar  7 16:10:03 2017) [sssd[be[mydomain.com]]] [pam_print_data] (0x0100): 
newauthtok type: 0
(Tue Mar  7 16:10:03 2017) [sssd[be[mydomain.com]]] [pam_print_data] (0x0100): 
priv: 1
(Tue Mar  7 16:10:03 2017) [sssd[be[mydomain.com]]] [pam_print_data] (0x0100): 
cli_pid: 5844
(Tue Mar  7 16:10:03 2017) [sssd[be[mydomain.com]]] [pam_print_data] (0x0100): 
logon name: not set
(Tue Mar  7 16:10:03 2017) [sssd[be[mydomain.com]]] [krb5_auth_send] (0x0100): 
Home directory for user [[email protected]] not known.
(Tue Mar  7 16:10:03 2017) [sssd[be[mydomain.com]]] [fo_resolve_service_send] 
(0x0100): Trying to resolve service 'AD'
(Tue Mar  7 16:10:03 2017) [sssd[be[mydomain.com]]] [resolve_srv_send] 
(0x0200): The status of SRV lookup is resolved
(Tue Mar  7 16:10:03 2017) [sssd[be[mydomain.com]]] [be_resolve_server_process] 
(0x0200): Found address for server dc3.mydomain.com: [<DC3IP>] TTL 3600
(Tue Mar  7 16:10:03 2017) [[sssd[krb5_child[5846]]]] [unpack_buffer] (0x0100): 
cmd [241] uid [1019289252] gid [400513] validate [true] enterprise principal 
[true] offline [false] UPN [username\@[email protected]]
(Tue Mar  7 16:10:03 2017) [[sssd[krb5_child[5846]]]] [unpack_buffer] (0x0100): 
ccname: [FILE:/tmp/krb5cc_1019289252_XXXXXX] old_ccname: 
[KEYRING:persistent:200389252] keytab: [/etc/krb5.keytab]
(Tue Mar  7 16:10:03 2017) [[sssd[krb5_child[5846]]]] [check_use_fast] 
(0x0100): Not using FAST.
(Tue Mar  7 16:10:03 2017) [[sssd[krb5_child[5846]]]] [switch_creds] (0x0200): 
Switch user to [1019289252][400513].
(Tue Mar  7 16:10:03 2017) [[sssd[krb5_child[5846]]]] [switch_creds] (0x0200): 
Switch user to [0][0].
(Tue Mar  7 16:10:03 2017) [[sssd[krb5_child[5846]]]] [privileged_krb5_setup] 
(0x0080): Cannot open the PAC responder socket
(Tue Mar  7 16:10:03 2017) [[sssd[krb5_child[5846]]]] [become_user] (0x0200): 
Trying to become user [1019289252][400513].
(Tue Mar  7 16:10:03 2017) [[sssd[krb5_child[5846]]]] [set_lifetime_options] 
(0x0100): Renewable lifetime is set to [7d]
(Tue Mar  7 16:10:03 2017) [[sssd[krb5_child[5846]]]] [set_lifetime_options] 
(0x0100): Lifetime is set to [3d]
(Tue Mar  7 16:10:03 2017) [[sssd[krb5_child[5846]]]] [set_canonicalize_option] 
(0x0100): Canonicalization is set to [true]
(Tue Mar  7 16:10:03 2017) [[sssd[krb5_child[5846]]]] [get_and_save_tgt] 
(0x0020): 1302: [-1765328378][Client 
'username\@MYDOMAIN.COM\@[email protected]' not found in Kerberos 
database]
(Tue Mar  7 16:10:03 2017) [[sssd[krb5_child[5846]]]] [map_krb5_error] 
(0x0020): 1371: [-1765328378][Client 
'username\@MYDOMAIN.COM\@[email protected]' not found in Kerberos 
database]
(Tue Mar  7 16:10:03 2017) [[sssd[krb5_child[5846]]]] [k5c_send_data] (0x0200): 
Received error code 1432158209
(Tue Mar  7 16:10:03 2017) [sssd[be[mydomain.com]]] [child_sig_handler] 
(0x0100): child [5846] finished successfully.
(Tue Mar  7 16:10:03 2017) [sssd[be[mydomain.com]]] [krb5_auth_done] (0x0040): 
The krb5_child process returned an error. Please inspect the krb5_child.log 
file or the journal for more information
(Tue Mar  7 16:10:03 2017) [sssd[pam]] [pam_dp_process_reply] (0x0200): 
received: [4 (System error)][mydomain.com]
(Tue Mar  7 16:10:03 2017) [sssd[pam]] [pam_reply] (0x0200): pam_reply called 
with result [4]: System error.
(Tue Mar  7 16:10:03 2017) [sssd[pam]] [filter_responses] (0x0100): 
[pam_response_filter] not available, not fatal.
(Tue Mar  7 16:10:03 2017) [sssd[pam]] [pam_reply] (0x0200): blen: 27
(Tue Mar  7 16:10:05 2017) [sssd[pam]] [client_recv] (0x0200): Client 
disconnected!
(Tue Mar  7 16:10:08 2017) [sssd[nss]] [client_recv] (0x0200): Client 
disconnected!

Logging over ssh with GSSAPI works. 
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