Try 'exists'. If this doesn't work, can you give more information about the report(variable) you are running and the tool you are using(RnA/Workspace/Report builder)?

Since you only have 75 props, one could go for an evar with hit expiration if they no longer have props to spare.Also, evars allow 255 bytes as opposed to 100 bytes in props.

If you are using DTM, then the function call would be different:_satellite.getVisitorId().getMarketingCloudVisitorID()You could also read the cookie using document.cookie and then apply string functions to get the AMCV cookie value.