Turning Off adding a new user

Turning Off adding a new user

Is it possible to turn off below setting, I just want my users to login correctly and deny if they dont enter correct credentials.

In cases where none of the specified conditions like 'ObjectGUID' , 'loginname+domainname', 'email address','loginname + domain=NULL' are absent in ServiceDesk Plus MSP , a new user will be added.

Thanks

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