It looks as though Roblox has disabled custom chat systems for every xbox player. CanUserChatAsync() and FilterStringAsync() now returns false for xbox players. What is the reason for this?
This is due to :
This was reported last night by Cindering
Topic can be found here: Xbox players can no longer chat, resulting in major loss of playercount
EDIT: I hope this has has helped a bit on what has happened!
Cindering reported this issue earlier in the week. (Xbox players can no longer chat, resulting in major loss of playercount)
The recent change was intentional to comply with Xbox requirements. Our team is working on a wider-community announcement that should go live early next week with more information.
Dupe - see linked thread.