The phrase "additional authorization for" is correct and usable in written English.
You can use it when referring to the need for extra permission or approval for a specific action or process.
Example: "Before proceeding with the project, we need to obtain additional authorization for the budget increase."
Alternatives: "extra approval for" or "further consent for".
"We are moving as rapidly as we can in New York to see whether we can get additional authorization for the international community to look at a broad range of actions — not just a no-fly zone, but other actions as well," Secretary of State Hillary Rodham Clinton told reporters during a visit to Cairo.
Congress should also contemplate an additional Authorization for the Use of Force (AUMF) – should the U.S. intervention in Syria enlarge in scope or scale – with a focus towards ensuring operational flexibility to U.S. commanders.
The only option currently defined is a flag indicating whether the browser should use the DNS to look up additional authorizations for the server (or its parent DNS domain) and, if so, how often.
We know of one retail bank that gave their call center representatives the edict to "delight" customers and permission to waive up to $150 in fees for any customer without seeking any additional authorization.
Not only do you need a license to hunt but for deer, pheasant and ducks, you need additional authorization.
"The administration is not currently seeking additional authorization," the statement said.
That gave the police the power to seize records without additional authorization.
This may lead to requiring additional authorization and security precautions when working with sensitive data.
Although you do not require additional work authorization for on campus jobs, you will require a Social Security Number (SSN) when you begin work.
The proposed extension to Feb. 16 included six years of additional funding authorization for the Children's Health Insurance Program for working-class kids, a provision added to help attract Democratic votes.
That would include disclosures on how institutions voted on new or existing annual bonus plans, new stock award and long-term incentive programs, and additional share authorizations for stock plans.
