Server not found in Kerberos database while sending the email notification to the owner - email

Question

I am getting below error while sending the mail to the server owner via ansible tool.
I am using ansible awx and defined all the variables inside the role. and role is calling via a playbook. playbook is attached to awx console.
email module is used in handlers inside the role.
SSH password:
PLAY [this playbook is used to start the services on windows server] ***********
TASK [Gathering Facts] *********************************************************
ok: [CSBPUITSM1.CSB.DOM]
TASK [/var/lib/awx/projects/roles/WINDOWS_CSB_APP_START : start the services on ITSM UAT] ***
changed: [CSBPUITSM1.CSB.DOM]
TASK [/var/lib/awx/projects/roles/WINDOWS_CSB_APP_START : debug] ***************
ok: [CSBPUITSM1.CSB.DOM] => {
"msg": "'ManageEngine ServiceDesk Plus' is started successfully on CSBPUITSM1"
}
RUNNING HANDLER [/var/lib/awx/projects/roles/WINDOWS_CSB_APP_START : send mail] ***
fatal: [CSBPUITSM1.CSB.DOM]: UNREACHABLE! => {"changed": false, "msg": "kerberos: authGSSClientStep() failed: (('Unspecified GSS failure. Minor code may provide more information', 851968), ('Server not found in Kerberos database', -1765328377))", "unreachable": true}
PLAY RECAP *********************************************************************
CSBPUITSM1.CSB.DOM : ok=3 changed=1 unreachable=1 failed=0 skipped=0 rescued=0 ignored=0
I have tried all the possible method like using variable inside the role playbook.
I want to send the notificaton mail to the server owner.