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This issue is fixed in the next update (3.5)
You may be able to logon and connect to Global Chat but when sending a message to Guild chat it will send but not post or appear in the chat history and you cannot see the chat either.
Fixing the problem
Unfortunately there is no short-term fix or workaround at this stage. The issue will be resolved with the update of 3.5 released in the next few months, however, Support is not able to directly provide any other assistance in the mean-time.
The development team is unable to fix this issue sooner as it requires an update to the game app/client which can only be released with the next update, 3.5.