Sure thing! I think you might have better luck using sessionDefaultChannelGrouping instead of defaultChannelGrouping. This guidance comes from Google Analytics 4’s migration guides, which suggests the use of sessionDefaultChannelGrouping in GA4, much like how we used ga:channelGrouping in Universal Analytics.

Here’s the thing to note though: defaultChannelGrouping is an attribution dimension. Meaning, if your GA4 property’s event attribution model is set to Data-driven, you aren’t going to get any rows from defaultChannelGrouping if your GA4 property hasn’t had a conversion during the date range you’ve selected.

I know, it’s a little finicky, but swap it around and you should start seeing that Organic search data roll in. Fingers crossed!