Check your system cron job's status to ensure that it is running correctly. This is the first step to addressing many automation problems.
Configure the system cron job as part of the WHMCS installation process and make certain that its daily tasks always run successfully.
Customize the time at which the system cron job runs and how often the system invokes it. The cron job must run at least once per day.
If more than one php.ini file exists, make sure to identify the php.ini file that your system uses when it executes the system cron job.
If the php.ini file that runs the system cron and your system use different PHP versions, you will need to adjust your configuration.