At work we are preparing for next year when UA (Universal Analytics) stops working in July. To do this we need to add GA4. One of the main things that we need (and that we also are having problems with) is having a roll up (or global) property. In UA we use a custom task to send each event twice, but this is sadly not possible with GA4.

One option is to connect properties using datastreams and "Connected Tags". What we need to do is have a datastream per property and then add the roll up property's GA4 Measurement ID to the list of "Connected Tags" on each of the country properties.

Since we are using GTM to setup our GA4 this is sadly not working. This method ONLY works for GA4 setups that use Gtag.