Hello, for some reason my chat option disappeared in my setting on the Nintendo switch... https://imgshare.io/image/7RCVH
You should file a ticket with support: https://help.daybreakgames.com/hc/en-us/categories/204228467-DC-UNIVERSE-ONLINE Someone else was having this issue on PlayStation.
I have got it working again. Support suggested removing the games saved data in my managment. It worked. So remove save data and your good to go.