I cannot get my serial number because I can't get into my ipad because it was locked due to incorrect password. I need to recover my ipad
No this is for an ipad that is locked -
iPad Pro 9.7-inch WiFi, Cellular
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You will need to restore the device using a computer. The process will erase the device. Later you can restore your data from a recent back-up. Instructions here…
If you forgot the passcode on your iPad, or your iPad is disabled - Apple Support