The cross conversion report is run to see purchases across both platforms.
Cross-environment conversion statistics show how the advertising campaign performed across all platforms, including tablet, smartphone, and desktop; app, and internet, regardless of device or environment in which a person converted.
Cross-environment reporting identifies a person across many contexts by using cookies, resettable device IDs, and aggregated sign in data. This enables search engine to follow the user's journey from first seeing an ad until conversion. There is no trace of the single user.
As a result, run the Cross-device conversions report.
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