Hey there! So, as per the details on the Google help center page, linking a GA4 roll-up property directly to Big Query isn’t possible at the moment. For now, it seems roll-up properties can only be directly linked to Google Ads. But, on the bright side, all data from source-property product integrations is accessible through the roll-up property. Take note though, a standard GA4 property has the capability to link to various products today, so perhaps we might see the same ability for roll-up properties some time in the future. Hope that helps explain things!