Why must I wrap a call to call to an async/await method in a Task?

Trying to to convert my old URL functionality to SwiftUI with async/await. While the skeleton below works, am puzzled as to why I must place my call to the method within a Task? When I don't use Task I get the error:

Cannot pass function of type '() async -> Void' to parameter expecting synchronous function type

From the examples I've seen, this wasn't necessary.

So I either I've misunderstood something, or I am doing this incorrectly, and am looking for little but of guidance.

Thank you

Within my SwiftUI view:

Button {
	Task {
		let request = xFile.makePostRequest(xUser: xUser, script: "requestTicket.pl")
		var result = await myNewURL.asyncCall(request: request)
		print("\(result)")
	}
}

From a separate class:

class MyNewURL: NSObject, ObservableObject {
	func asyncCall(request: URLRequest) async -> Int {
		
		do {
			let (data, response) = try await URLSession.shared.data(for: request)
			guard let httpResponse = response as? HTTPURLResponse
			else {
				print("error")
				return -1
			}
			if httpResponse.statusCode == 200 {
				...
			}
		} catch {
			return -2
		}
		return 0
	}
}