I have tested above config in my lab and failed but below config is working fine.
Please change $SPLUNK_HOME$/etc/apps/DTw_CRC/linux_x86_64/bin/python.path with below config
$SPLUNK_HOME/bin/python
Add below config in $SPLUNK_HOME$/etc/apps/DTw_CRC/metadata/default.meta
[alert_actions/DigitalTwingKeepwareCRC]
access = read : [ * ], write : [ admin ]
export = system
owner = nobody
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