我正在尝试处理一段代码，得到了这样的错误：

error[E0277]: a value of type `Result<Vec<tor_llcrypto::pk::curve25519::PublicKey>, AuthorizedClientConfigError>` cannot be built from an iterator over elements of type `Vec<tor_llcrypto::pk::curve25519::PublicKey>`
   --> crates/tor-hsservice/src/svc/publish/descriptor.rs:194:10
    |
194 |         .collect();
    |          ^^^^^^^ value of type `Result<Vec<tor_llcrypto::pk::curve25519::PublicKey>, AuthorizedClientConfigError>` cannot be built from `std::iter::Iterator<Item=Vec<tor_llcrypto::pk::curve25519::PublicKey>>`
    |
    = help: the trait `FromIterator<Vec<tor_llcrypto::pk::curve25519::PublicKey>>` is not implemented for `Result<Vec<tor_llcrypto::pk::curve25519::PublicKey>, AuthorizedClientConfigError>`
    = help: the trait `FromIterator<Result<A, E>>` is implemented for `Result<V, E>`
note: the method call chain might not have had the expected associated types

我的代码如下所示：

let auth_client_keys: Result<Vec<curve25519::PublicKey>, Error> = auth_clients
    .authorized_client
    .iter()
    .flat_map(|client| match client {
        Curve25519Key(key) => Ok(vec![**key]),
        DirectoryOfKeys(dir) => {
            let mut keys = Vec::<curve25519::PublicKey>::new();

            Ok(keys)
        }
    })
    .collect()

我不知道如果我用iter()和flat_map()迭代一个循环，我怎么能返回到Result<Vec<curve25519::PublicKey>, AuthorizedClientConfigError>这样的类型。我该如何做，并修复上述错误？
用for循环会更好吗，因为这通常更容易？
我期望它将PublicKey类的Map合并到一个for循环中。相反，我得到了上面的错误。