I know this is an old question but maybe this will help a beginner out there like me.
It is important to make sure that the value of the field has double quotes around it.
For example:
| makemv delim="," Field
Field=192.168.1.100,192.168.1.120 => will NOT work
Field="192.168.1.100,192.168.1.120" => will work
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