Need help unlocking my ipad

Does the below apply?

If you need to enter your passcode

You might need to enter your passcode or Apple ID instead of using Touch ID in these situations:

• You just restarted your device
• Your fingerprint isn't recognized five times in a row
• You haven't unlocked your device in more than 48 hours 
• You just enrolled or deleted fingerprints
• You're trying to open Touch ID & Passcode in the Settings menu
• You used Emergency SOS.

If Touch ID isn't working on your iPhone or iPad - Apple Support

If you forgot your passcode.

Passcode - If you forgot the passcode for your iPad or your device is disabled.     

So what happens when you try to unlock it using your fingerprint?

Is it requesting a passcode you don't know?

You need to explain exactly what is happening and provide details fro any one to help you.