There is no one correct answer, here, and consistency is very important. One last note is that the term "reauthenticate" has a similar problem but can be avoided by simply using the word "authenticate." Certain dictionaries do include an entry for "reauthenticate", however.

How do you spell Reauthenticate?

Renewed authentication; an instance of this.

Is Deauthenticate a word?

(transitive, computing) To revoke the authentication of; to cause no longer to be authenticated.