Can't Control Aileron after replacing servo

I just replaced the aileron servo motors on my plane (identical servo model I was previously using). When I power up and connect to Mission Planner the servo locks the aileron in its most upward position. I am unable to move the aileron with the transmitter. In radio calibration, a roll response is noted when physically toggling the joystick on the transmitter. Is there any additional calibration that needs to be done here to correctly configure the servos? Thanks.

Did you make sure the servo was centred before you installed the horn onto it? Sounds like it’s bound onto it’s end-stops.

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Thanks @Allister. I did not - makes sense that this would be the issue. Will try centering and see.