There are various Connect IQ apps out there that allow Stryd Power onto the Garmin watch. For example, PowerDashboard and Run Power. These apps are great and Garmin does record power data. However, the data will not transfer to PowerCenter. Only data recorded by one of the Stryd apps will be accepted. A workaround is to have the Stryd power data field active on one of your run data screens (only works if you are using a third party data field as opposed to an app that replaces the run mode).
If you need additional assistance, contact firstname.lastname@example.org.