Notes password
What do I do if I forgot my notes password?
iPhone 11, iOS 14
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There isn't anything you can do. From the article below.
If you forgot your notes password
To unlock a note, you need to enter the password that it's locked with. If you forgot the password, Apple can't help you regain access to your locked notes. You can create a new password, but this won’t give you access to your old notes.