Solved Sending a message to a player during a Conversation

I'm using a conversation to piece together a letter that a player can send to another player. When they finish composing the letter, it will be sent. Using the same thread as the Conversation, a message will be sent to the player. However, for some reason, the player never recieves the message. I've checked pretty much everything, and it seems to be fine. There are no exceptions being thrown, and the send message method is being run. Thing is, the same method being called on the main thread works just fine.

That shouldnt be it though, since queuing a synchronous runnable that sends the message ALSO doesnt work.

The method works fine when being called directly from a command, so.. Any ideas what could possible make a message never send? You can find the method here

Whoops, forgot to set my modality. Derp.

EDIT by Moderator: merged posts, please use the edit button instead of double posting.