Error 21626: Invalid 'StatusCallbackEvent' when using the Rust client for Twilio's API

[CTFcrozone]

I'm encountering Twilio error 21626: Invalid 'StatusCallbackEvent' when using the twilio openapi generated crate to initiate a call and track its status.

The same parameters work correctly when sent from a TypeScript client, but fail in Rust, even though the StatusCallbackEvent values are identical.

Snippet of the rust code:

let params = CreateCallParams {
	account_sid,
	to: to.to_string(),
	from: from.to_string(),
	url: Some("https://handler.twilio.com/twiml/EH93b5aded9d7acc065df056e7aab03b17".to_string()),
	status_callback: Some("https://my-ngrok-url.ngrok-free.app/twilio".to_string()),
	status_callback_event: Some(vec![
		"initiated".to_string(),
		"ringing".to_string(),
		"answered".to_string(),
		"completed".to_string(),
	]),
	..Default::default()
};

match create_call(&twilio_config, params).await {
	Ok(resp) => println!("Call initiated successfully: {:?}", resp),
	Err(e) => eprintln!("Failed to initiate call: {:?}", e),
}

I tested the typescript call status monitoring and it worked correctly, so I compared the request from typescript and the request from rust:

Typescript:

Transcribe=false&Trim=trim-silence&Timeout=55&StatusCallback=https%3A%2F%2F227e97e53e35.ngrok-free.app%2Ftwilio&From=%2BNUMBER&Method=GET&StatusCallbackEvent=initiated%2C+ringing%2C+answered%2C+completed&AccountSid=ACf05dcbb291ca3a61ab0def0f64f61835&Url=https%3A%2F%2Fhandler.twilio.com%2Ftwiml%2FEH93b5aded9d7acc065df056e7aab03b17&StatusCallbackMethod=POST&AsyncAmd=false&To=%2BNUMBER&MachineDetectionTimeout=0

Rust:

Transcribe=false&Trim=trim-silence&Timeout=55&StatusCallback=https%3A%2F%2F2ceab4754dc5.ngrok-free.app%2Ftwilio&From=%2BNUMBER&Method=POST&StatusCallbackEvent=initiated%2C+ringing%2C+answered%2C+completed&AccountSid=ACf05dcbb291ca3a61ab0def0f64f61835&Url=https%3A%2F%2Fhandler.twilio.com%2Ftwiml%2FEH93b5aded9d7acc065df056e7aab03b17&StatusCallbackMethod=POST&AsyncAmd=false&To=%2BNUMBER&MachineDetectionTimeout=0

The parameter values are identical, All other key parameters (e.g., To, From, StatusCallback, Url) are correct.

I need help troubleshooting this.