Looks to be a bug, I've created a ticket for this
https://github.com/netxms/netxms/issues/3219
https://github.com/netxms/netxms/issues/3219
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Show posts Menujournalctl -u netxms-reporting.service
Also note, that if you changed some parameters in SMTP-Text notification channel properties you need to restart reporting server for the changes to have effect