I can’t get my iPad to recognize my fingerprint know I will recognize my passcode What do I need to do to get it open

While there is this support article about Touch ID and workaround, should it fail to work;

not certain how or why it hasn't functioned, according to directions in your instance.

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

https://support.apple.com/en-us/HT207537

"If the previous steps didn't help, you see "Failed—unable to complete Touch ID setup", or

either of the following happen when you go to Settings > Touch ID & Passcode, take your

device to an Apple Retail Store or Apple Authorized Service Provider, or contact Apple Support:

• You can't turn on Touch ID
• Touch ID is dimmed or grayed out

[The instructions cover variables, including these; while I'd guess you have already

visited the support page above, because your post here includes the URL within it.]

"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 you have not read this companion article, please read for more info.]

Because your topic appears in 'macOS 10.13.6 High Sierra' community

not sure how these steps may, or may not, have functioned correctly.