Getting _grokparsefailure for an unkown reason

I am tryinf to make a grok filter for the Synology NAS syslog messages, but I keep on getting a _grokparsefailure even though my filter works according to

"<%{POSINT:syslog_pri}>%{SYSLOGTIMESTAMP:syslog_timestamp} %{SYSLOGHOST:syslog_hostname} %{WORD:program} %{GREEDYDATA:syslog_message}"

And here is what a log message looks like:
<14>Nov 14 15:05:28 sflns001 Connection username:\tUser [USERNAME] logged in from [] via [DSM].\n

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