power outage off

i have a elite power mag smart b+ trainer. i have it hooked up as the power source and cadence and sensor . while riding normally the power seems about right but cannot sprint above 300 watts no matter what gear i am in or spinning at 113 rpm,s. it makes joining any group rides impossible as i will be dropped as soon as the watts go above 200. any suggestions would be greatly appreciated.

make sure you have paired it as a powermeter and not classic trainer with speed sensor.

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