Looks like 2.0.45 is the new firmware for the AMBIT3 series that fully supports the STRYD POWER running pod.
As Paul1928 said: “Pair the Stryd as just a heart rate pod only (doesn’t seem to matter if you’ve previously paired as a Power Pod – but it’s no longer necessary), don’t have a Power Pod checked in “PODs to search” for your running sport mode in Movescount. Start your run, it finds the Stryd as a Heart Rate Pod (and only a Heart Rate Pod) and you have heart-rate and power metrics working. Cadence is also working again.”
Comment: Garmin?? Polar?