I have a garmin forerunner 245 and a powermeter garmin vector 3?
After buying the powermeter I realized that although in theory these two systems being compatible (both comunicating via ant+ or bluetooth) in practice garmin has locked some software features making the connection not straightforward.
I have now been able to start having the powerdata on my forerunner245 by using an connect IQ app named datafields4. This allows the power data to both be seen on my watch and on the garmin connect activity. Yet it is not taken for, for example, computing average power over 20 minutes or maximum power.... relevant metrics to support your training that are provided by garmin.
How can this be fixed? I find it unacceptable that garmin does not provide this sort of compatibility across their hardware...