"To revoke the authorization" means to cancel or take back permission that was previously given to someone or something. It basically means to withdraw the right or ability to do something. Full definition
We may revoke this authorization at any time. (sho.com)
You have the right to revoke your authorization in writing, except to the extent we have already relied upon it. (pennmedicine.org)
23.3 (1) At any time after suspending the authorization of an electronic document submitter under section 23.1, the Director of Land Registration may, by order and without holding a hearing, withdraw the suspension if that Director has not revoked the authorization under section 23.2 and if that Director considers it in the public interest to withdraw the suspension. (ontario.ca)