'voluntary request' is correct and usable in written English.
It is used to describe a request that is not required or obligatory, but is made out of a desire to do something or change something. For example, "The employee submitted a voluntary request to switch shifts with a colleague."
"The board, confronted by the expectation that the company would not be able to cope with its maturing current debt payments, agreed to file a voluntary request for bankruptcy".
Health officials obtained a formal order to force the residents to stay at home, after admitting they had not complied with a voluntary request to do so on Wednesday.
Health officials obtained an order to force the four family members to stay at home, after admitting they had not complied with a voluntary request to do so on Wednesday.
Mass screening of suspect populations, like the detainees, or people on the mail-collection route of a Trenton postal worker who contracted anthrax, or any group that Ms. Nguyen might have met, would raise legal issues, and even a voluntary request for blood might be seen as coercive.
We have now received a voluntary request for information from the SEC regarding "Pre-IPO Pooled Investment Funds".
Tesla issued a statement at the time of the article, acknowledging that it had received a voluntary request for documents from the Department of Justice about its public guidance for the Model 3 ramp.
The act would require the police to let such people go, even if Immigration and Customs Enforcement officials have issued voluntary requests, known as detainers, that they be held until they can be picked up for deportation.
States cannot establish their own immigration policies, and no federal law imposes criminal penalties for disregarding voluntary requests from ICE to keep people detained.
Trump and his administration have stated and implied that it's against the law for jurisdictions to decline voluntary requests to detain people for ICE ― something legal experts say is not true.
"This is the third time the FDA has started the process of using its mandatory recall authority, but the first time" it's issued such an order due to a company rebuffing the voluntary recall request, the agency said in a statement.
Although voluntary, this request motivated most producers to begin directly reusing a major fraction of their produced water or reusing it after treatment in dedicated commercial treatment plants that are equipped to handle its contaminants.
