while executing the ktpass command warning Unable to set SPN mapping data appeared

Hi All,

while executing the ktpass command from administrator command prompt on windows server machine:
C:\Users\Administrator>ktpass -princ host/<hostname>@<active directory domain> -mapuser <domain name>\TestU1 -pass * -crypto AES128-SHA1 -ptype KRB5_NT_PRINCIPAL -out C:\KeyTab\TestAES128.keytab

below warning message appeared:

Failed to set property 'servicePrincipalName' to 'host/<host name>' on
Dn 'CN=<CN Name>,CN=Users,DC=<DC Name>,DC=<DC Name>,DC=com': 0x13.
WARNING: Unable to set SPN mapping data.
If <user name> already has an SPN mapping installed for host/<host name>, this is no cause for concern.
Key created.

it is confirmed that no other user in the AD DC is configured with same host/<hostname>

please suggest how to resolve above warning.

Thanks