Hi @tinzion,
Thanks for reaching out. I’m sorry for the delay here.
You can check if dual tracking is working by visiting analytics.google.com and checking the Realtime reports for both your UA and GA4 properties. For more information on this, please see this guide: https://www.monsterinsights.com/how-to-check-if-google-analytics-is-working/
When viewing MonsterInsights reports at Insights ? Reports, the data being displayed is from the authenticated Google Analytics property only. If you would like to confirm which property, you can see it listed as the Active Profile at Insights ? Settings. To view reports on the dual tracked profile, you’ll need to visit analytics.google.com.
I hope this information helps. If you feel you need more assistance, or would like for us to take a closer look, would you be able to reach out to us at https://www.monsterinsights.com/lite-support/?
Thanks so much!