Touch ID: Cancelled by another authentication
My Touch ID stopped working after a failed attempt to reset my keychains to try to solve a different problem, related to iMessage. All of my fingerprints disappeared and now I cannot add a new one: I get the message given above.
In a previous thread on this same issue, the most helpful reply said to delete the Keychains folder under Finder->Go->Library. This did NOT work for me; the problem continues. I cannot add any new fingerprints or even select the purposes for which I would like to use Touch ID: I get the same error message.
Additional information: after deleting my Keychains folder I tried once again resetting my default keychains. This time I was able to create a new, empty login keychain with no password. The instructions said to change the password for the keychain with Edit->Change password for keychain, but this entry is grayed out, and now when I try to reset my default keychains, and enter my password, I get "Unable to obtain authorization for this operation".
Any helpful guidance would be appreciated here.