Can't Chat in Cubecraft

[PlusAussie]

I've been playing Cubecraft for months, close to a year now, and my ability to chat has been fine. However, lately when I chat the people in my party, or really anyone in the server says it's not showing up for them. I've purchased a VIP status, and changed my gamertag colour, but that won't show up when I type either. I'm not muted, and I've tried appealing but the website says I have nothing to appeal. There's nothing wrong with my settings in either Cubecraft or Minecraft. Just to be sure I've even set every setting back to default, but nothing is working. I've checked my microsoft account and everything is set to Everybody, so that's fine. Ive tried basically everything but I'm at a loss. I really need the ability to chat, especially since my mic is broken and I'm unable to audibly chat with anyone in an Xbox party. Please help.