posted_data returns “Array”

Hello everyone, after resolving one problem, there’s always an other one hiding behind haha (but not on the same scale at least).

So before you tell me this, I know there was a topic about the same subject : https://www.ads-software.com/support/topic/get_posted_data-return-array-and-not-selected-value-in-dropdown-select/
But it didn’t helped me for my case and I couldn’t find anything on the web after browsing for 20~30 mins (either my research are very bad or there’s nothing) and this topic got left for now 7 months ago.

So in my case, the problem is when I’m sending an email via my php function here :

function action_wpcf7_before_send_mail( $contact_form ){
	if($form_id = 11057){
      $submission = WPCF7_Submission::get_instance();
      $posted_data = $submission->get_posted_data();
      if( $posted_data['checkbox'][0] ) {
				$to = $posted_data['email'];
				$subject = "Meeting recap";
				$message .= "Date and Time of the meeting: ".$posted_data['radio']." à ".$posted_data['hour']."h

For the $posted_data[‘radio’] and the $posted_data[‘hour’], I’m having “Array” written in the body message instead of what the user select.

The $posted_data[‘radio’] is from a radio tag of course, as for the [‘hour’] one, it’s from a select tag. I also don’t understand why the radio returns me an array when it is not one.

Hope I was clear with what I want and my explanation, thank you in advance for your replies!