change from 'stopped' to 'running' failed: Systemd start for puppetserver failed!
journalctl log for puppetserver:
-- No entries --
Source: /Stage[main]/Notifier::Service/Service[puppetserver]/ensure
File: /etc/puppetlabs/code/environments/production/modules/notifier/manifests/service.pp
Line: 2
Puppet Enterprise has the service "pe-puppetserver" whereas this module declares a service "puppetserver" and tries to ensure it is running as per https://github.com/slenky/puppet-notifier/commit/5bc3f0eef7fedf50457994769f4d1dc766832673
So, puppet agent runs on the master fail like so: