Microsoft: Why I can not send message to my friend in Xbox One

Yes. I have had the same problem sending messages to people who aren't on my friends list. It's been going on for 3 months. If I send them a friend request and if the friend request is pending I am able to send them a message with no problem. If they aren't
on my friends list I get a message that says message could not be sent "xbox live" I am on the phone with microsoft now and they don't know what's going on. If I send them a message like 15 or 20 tries sometimes I can get a message to go through.

I had the exact same problem yesterday and this happens once in a while to many people but no one knows why. I can send messages and send invites, but dont recieve anything. This happened to a couple of my friends yesterday too.

Still trying to figure this out. Any help from Microsoft would be great.

No restrictions on my console or account.

CAN send messages to friends.

CAN send messages if a friend request is pending between me and a person.

CAN send messages to people who are non friends BUT it will not do it on the first try. I must try at least 20-35 times now. This is seriously getting out of hand. It's only MY account too, I've made other accounts to see if it's my console, but they work
just fine in receiving/sending messages.

also why cant i send a voice or video message to my friends?

I don't think that Phone users are allowed to make/join parties that why Microsoft implemented party chat where iPhone user can send they friend a party chat so that their friend can join through the message. to be able to use party chat you need to have
a chat group with all your friends in it and send a party chat.