I would start by running icinga2 in debug mode in foreground and filter
the output:
icinga2 daemon -x notice | grep nrpe
Reschedule your check (or wait until it is being executed) and extract
the exact commandline which will be executed by icinga2.
Once you have that, go from there to identify any error.
Of course, don't forget to restart icinga2 as daemon.
Regards,
Markus
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