Add channel member

POST https://graph.microsoft.com/v1.0/teams/{{TeamId}}/channels/{{ChannelId}}/members

Request Body

{"@odata.type"=>"#microsoft.graph.aadUserConversationMember", "roles"=>["owner"], "user@odata.bind"=>"https://graph.microsoft.com/v1.0/users/8b081ef6-4792-4def-b2c9-c363a1bf41d5"}