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Regarding PAM authentication failure

Hi Team,

recently we have created one of the user in our CENT OS and it has root privileges.
Same user has been shared to monitoring team to monitor the services of host.
But when login to that host locally showing as hundreds of authentication failure from monitoring host XXXX since last successful login.
same error can been seen in monitoring portal also as too many authentication failures.

when looked at sshd logs getting as below
sshd[1152]: error: PAM: Authentication failure for user (XXXX) from monitoring poller

How can we fix this authentication issue

Please assist

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