Try this workaround to help resolve any issues sending messages in Guild or Global Chat on Xbox One.
Close Gems of War. Next, from the home screen on Xbox:
- Select your Xbox Live icon/profile
- Account > Privacy and online safety
- Xbox Live data > View details and customise
- Communication and multiplayer
- Change "Others can communicate with voice, text, or invites..." to "Everybody" and ensure "Join multiplayer games" is set to "Allow".
Ensure all Guild members or players you are trying to talk to have performed this to help resolve chat messaging problems. Have them follow these steps to check the settings are correct, even if they think they are.